Hello. Thanks for helping.

First the result of the command :

$ dpkg -l | grep -Ei '(x2go|nx)'

ii  inxi                                        2.2.35-0ubuntu1                            all          full featured system information script
ii  libnx-x11-6:amd64                           2:3.5.99.15-0~201803072246~ubuntu16.04.1   amd64        nxagent's libNX_X11 client-part library
ii  libx2go-log-perl                            4.1.0.0-0~1517~ubuntu16.04.1               all          Perl X2Go::Log package
ii  libx2go-server-db-perl                      4.1.0.0-0~1517~ubuntu16.04.1               amd64        Perl X2Go::Server:DB package
ii  libx2go-server-perl                         4.1.0.0-0~1517~ubuntu16.04.1               all          Perl X2Go::Server package
ii  libxcomp3:amd64                             2:3.5.99.15-0~201803072246~ubuntu16.04.1   amd64        NX compression library
ii  libxcompshad3:amd64                         2:3.5.99.15-0~201803072246~ubuntu16.04.1   amd64        NX shadowing library
ii  nx-x11-common                               2:3.5.99.15-0~201803072246~ubuntu16.04.1   all          nx-X11 (common files)
ii  nxagent                                     2:3.5.99.15-0~201803072246~ubuntu16.04.1   amd64        Nested Xserver (aka NX Agent) supporting the NX compression protocol
ii  nxproxy                                     2:3.5.99.15-0~201803072246~ubuntu16.04.1   amd64        NX proxy
rc  x2goagent                                   2:3.5.0.33-0~710~ubuntu16.04.1             all          X2Go agent
ii  x2goserver                                  4.1.0.0-0~1517~ubuntu16.04.1               amd64        X2Go server daemon scripts
ii  x2goserver-common                           4.1.0.0-0~1517~ubuntu16.04.1               amd64        X2Go Server (common files)
ii  x2goserver-extensions                       4.1.0.0-0~1517~ubuntu16.04.1               all          X2Go Server (extension support)
ii  x2goserver-fmbindings                       4.1.0.0-0~1517~ubuntu16.04.1               all          X2Go Server (file manager bindings)
ii  x2goserver-printing                         4.1.0.0-0~1517~ubuntu16.04.1               all          X2Go server (printing support)
ii  x2goserver-x2goagent                        4.1.0.0-0~1517~ubuntu16.04.1               all          X2Go Server's X2Go Agent
ii  x2goserver-xsession                         4.1.0.0-0~1517~ubuntu16.04.1               all          X2Go Server (Xsession runner)



Now, when I have a look at /var/log/syslog, I see this :
Mar 15 12:55:02 ServeurITeN x2golistsessions_sql: executing external command ,,x2gopath'' with args: libexec
Mar 15 12:55:02 ServeurITeN x2golistsessions_sql: executing external command ,,/usr/lib/x2go/libx2go-server-db-sqlite3-wrapper'' with args: listsessionsroot,ServeurITeN
Mar 15 12:55:04 ServeurITeN x2golistsessions_sql: executing external command ,,x2gopath'' with args: libexec
Mar 15 12:55:04 ServeurITeN x2golistsessions_sql: executing external command ,,/usr/lib/x2go/libx2go-server-db-sqlite3-wrapper'' with args: listsessionsroot,ServeurITeN
Mar 15 12:55:06 ServeurITeN x2golistsessions_sql: executing external command ,,x2gopath'' with args: libexec
Mar 15 12:55:06 ServeurITeN x2golistsessions_sql: executing external command ,,/usr/lib/x2go/libx2go-server-db-sqlite3-wrapper'' with args: listsessionsroot,ServeurITeN
Mar 15 12:55:08 ServeurITeN x2golistsessions_sql: executing external command ,,x2gopath'' with args: libexec
Mar 15 12:55:08 ServeurITeN x2golistsessions_sql: executing external command ,,/usr/lib/x2go/libx2go-server-db-sqlite3-wrapper'' with args: listsessionsroot,ServeurITeN
Mar 15 12:55:11 ServeurITeN x2golistsessions_sql: executing external command ,,x2gopath'' with args: libexec
Mar 15 12:55:11 ServeurITeN x2golistsessions_sql: executing external command ,,/usr/lib/x2go/libx2go-server-db-sqlite3-wrapper'' with args: listsessionsroot,ServeurITeN
Mar 15 12:55:13 ServeurITeN x2golistsessions_sql: executing external command ,,x2gopath'' with args: libexec
Mar 15 12:55:13 ServeurITeN x2golistsessions_sql: executing external command ,,/usr/lib/x2go/libx2go-server-db-sqlite3-wrapper'' with args: listsessionsroot,ServeurITeN
Mar 15 12:55:15 ServeurITeN x2golistsessions_sql: executing external command ,,x2gopath'' with args: libexec
Mar 15 12:55:15 ServeurITeN x2golistsessions_sql: executing external command ,,/usr/lib/x2go/libx2go-server-db-sqlite3-wrapper'' with args: listsessionsroot,ServeurITeN
Mar 15 12:55:17 ServeurITeN x2golistsessions_sql: executing external command ,,x2gopath'' with args: libexec
Mar 15 12:55:17 ServeurITeN x2golistsessions_sql: executing external command ,,/usr/lib/x2go/libx2go-server-db-sqlite3-wrapper'' with args: listsessionsroot,ServeurITeN
Mar 15 12:55:20 ServeurITeN x2golistsessions_sql: executing external command ,,x2gopath'' with args: libexec
Mar 15 12:55:20 ServeurITeN x2golistsessions_sql: executing external command ,,/usr/lib/x2go/libx2go-server-db-sqlite3-wrapper'' with args: listsessionsroot,ServeurITeN
Mar 15 12:55:22 ServeurITeN x2golistsessions_sql: executing external command ,,x2gopath'' with args: libexec
Mar 15 12:55:22 ServeurITeN x2golistsessions_sql: executing external command ,,/usr/lib/x2go/libx2go-server-db-sqlite3-wrapper'' with args: listsessionsroot,ServeurITeN
Mar 15 12:55:24 ServeurITeN x2golistsessions_sql: executing external command ,,x2gopath'' with args: libexec
Mar 15 12:55:24 ServeurITeN x2golistsessions_sql: executing external command ,,/usr/lib/x2go/libx2go-server-db-sqlite3-wrapper'' with args: listsessionsroot,ServeurITeN
Mar 15 12:55:26 ServeurITeN x2golistsessions_sql: executing external command ,,x2gopath'' with args: libexec
Mar 15 12:55:26 ServeurITeN x2golistsessions_sql: executing external command ,,/usr/lib/x2go/libx2go-server-db-sqlite3-wrapper'' with args: listsessionsroot,ServeurITeN
Mar 15 12:55:28 ServeurITeN x2golistsessions_sql: executing external command ,,x2gopath'' with args: libexec
Mar 15 12:55:28 ServeurITeN x2golistsessions_sql: executing external command ,,/usr/lib/x2go/libx2go-server-db-sqlite3-wrapper'' with args: listsessionsroot,ServeurITeN
Mar 15 12:55:31 ServeurITeN x2golistsessions_sql: executing external command ,,x2gopath'' with args: libexec
Mar 15 12:55:31 ServeurITeN x2golistsessions_sql: executing external command ,,/usr/lib/x2go/libx2go-server-db-sqlite3-wrapper'' with args: listsessionsroot,ServeurITeN
Mar 15 12:55:33 ServeurITeN x2golistsessions_sql: executing external command ,,x2gopath'' with args: libexec
Mar 15 12:55:33 ServeurITeN x2golistsessions_sql: executing external command ,,/usr/lib/x2go/libx2go-server-db-sqlite3-wrapper'' with args: listsessionsroot,ServeurITeN
Mar 15 12:55:35 ServeurITeN x2golistsessions_sql: executing external command ,,x2gopath'' with args: libexec
Mar 15 12:55:35 ServeurITeN x2golistsessions_sql: executing external command ,,/usr/lib/x2go/libx2go-server-db-sqlite3-wrapper'' with args: listsessionsroot,ServeurITeN
Mar 15 12:55:37 ServeurITeN x2golistsessions_sql: executing external command ,,x2gopath'' with args: libexec
Mar 15 12:55:37 ServeurITeN x2golistsessions_sql: executing external command ,,/usr/lib/x2go/libx2go-server-db-sqlite3-wrapper'' with args: listsessionsroot,ServeurITeN
Mar 15 12:55:39 ServeurITeN x2golistsessions_sql: executing external command ,,x2gopath'' with args: libexec
Mar 15 12:55:39 ServeurITeN x2golistsessions_sql: executing external command ,,/usr/lib/x2go/libx2go-server-db-sqlite3-wrapper'' with args: listsessionsroot,ServeurITeN
Mar 15 12:55:42 ServeurITeN x2golistsessions_sql: executing external command ,,x2gopath'' with args: libexec
Mar 15 12:55:42 ServeurITeN x2golistsessions_sql: executing external command ,,/usr/lib/x2go/libx2go-server-db-sqlite3-wrapper'' with args: listsessionsroot,ServeurITeN
Mar 15 12:55:44 ServeurITeN x2golistsessions_sql: executing external command ,,x2gopath'' with args: libexec
Mar 15 12:55:44 ServeurITeN x2golistsessions_sql: executing external command ,,/usr/lib/x2go/libx2go-server-db-sqlite3-wrapper'' with args: listsessionsroot,ServeurITeN
Mar 15 12:55:46 ServeurITeN x2golistsessions_sql: executing external command ,,x2gopath'' with args: libexec
Mar 15 12:55:46 ServeurITeN x2golistsessions_sql: executing external command ,,/usr/lib/x2go/libx2go-server-db-sqlite3-wrapper'' with args: listsessionsroot,ServeurITeN
Mar 15 12:55:48 ServeurITeN x2golistsessions_sql: executing external command ,,x2gopath'' with args: libexec
Mar 15 12:55:48 ServeurITeN x2golistsessions_sql: executing external command ,,/usr/lib/x2go/libx2go-server-db-sqlite3-wrapper'' with args: listsessionsroot,ServeurITeN
Mar 15 12:55:51 ServeurITeN x2golistsessions_sql: executing external command ,,x2gopath'' with args: libexec
Mar 15 12:55:51 ServeurITeN x2golistsessions_sql: executing external command ,,/usr/lib/x2go/libx2go-server-db-sqlite3-wrapper'' with args: listsessionsroot,ServeurITeN
Mar 15 12:55:53 ServeurITeN x2golistsessions_sql: executing external command ,,x2gopath'' with args: libexec
Mar 15 12:55:53 ServeurITeN x2golistsessions_sql: executing external command ,,/usr/lib/x2go/libx2go-server-db-sqlite3-wrapper'' with args: listsessionsroot,ServeurITeN
Mar 15 12:55:55 ServeurITeN x2golistsessions_sql: executing external command ,,x2gopath'' with args: libexec
Mar 15 12:55:55 ServeurITeN x2golistsessions_sql: executing external command ,,/usr/lib/x2go/libx2go-server-db-sqlite3-wrapper'' with args: listsessionsroot,ServeurITeN
Mar 15 12:55:57 ServeurITeN x2golistsessions_sql: executing external command ,,x2gopath'' with args: libexec
Mar 15 12:55:57 ServeurITeN x2golistsessions_sql: executing external command ,,/usr/lib/x2go/libx2go-server-db-sqlite3-wrapper'' with args: listsessionsroot,ServeurITeN
Mar 15 12:55:59 ServeurITeN x2golistsessions_sql: executing external command ,,x2gopath'' with args: libexec
Mar 15 12:55:59 ServeurITeN x2golistsessions_sql: executing external command ,,/usr/lib/x2go/libx2go-server-db-sqlite3-wrapper'' with args: listsessionsroot,ServeurITeN
Mar 15 12:56:02 ServeurITeN x2golistsessions_sql: executing external command ,,x2gopath'' with args: libexec
Mar 15 12:56:02 ServeurITeN x2golistsessions_sql: executing external command ,,/usr/lib/x2go/libx2go-server-db-sqlite3-wrapper'' with args: listsessionsroot,ServeurITeN
Mar 15 12:56:04 ServeurITeN x2golistsessions_sql: executing external command ,,x2gopath'' with args: libexec
Mar 15 12:56:04 ServeurITeN x2golistsessions_sql: executing external command ,,/usr/lib/x2go/libx2go-server-db-sqlite3-wrapper'' with args: listsessionsroot,ServeurITeN
Mar 15 12:56:06 ServeurITeN x2golistsessions_sql: executing external command ,,x2gopath'' with args: libexec
Mar 15 12:56:06 ServeurITeN x2golistsessions_sql: executing external command ,,/usr/lib/x2go/libx2go-server-db-sqlite3-wrapper'' with args: listsessionsroot,ServeurITeN
Mar 15 12:56:08 ServeurITeN x2golistsessions_sql: executing external command ,,x2gopath'' with args: libexec
Mar 15 12:56:08 ServeurITeN x2golistsessions_sql: executing external command ,,/usr/lib/x2go/libx2go-server-db-sqlite3-wrapper'' with args: listsessionsroot,ServeurITeN
Mar 15 12:56:10 ServeurITeN x2golistsessions_sql: executing external command ,,x2gopath'' with args: libexec
Mar 15 12:56:10 ServeurITeN x2golistsessions_sql: executing external command ,,/usr/lib/x2go/libx2go-server-db-sqlite3-wrapper'' with args: listsessionsroot,ServeurITeN
Mar 15 12:56:13 ServeurITeN x2golistsessions_sql: executing external command ,,x2gopath'' with args: libexec
Mar 15 12:56:13 ServeurITeN x2golistsessions_sql: executing external command ,,/usr/lib/x2go/libx2go-server-db-sqlite3-wrapper'' with args: listsessionsroot,ServeurITeN
Mar 15 12:56:15 ServeurITeN x2golistsessions_sql: executing external command ,,x2gopath'' with args: libexec
Mar 15 12:56:15 ServeurITeN x2golistsessions_sql: executing external command ,,/usr/lib/x2go/libx2go-server-db-sqlite3-wrapper'' with args: listsessionsroot,ServeurITeN
Mar 15 12:56:17 ServeurITeN x2golistsessions_sql: executing external command ,,x2gopath'' with args: libexec
Mar 15 12:56:17 ServeurITeN x2golistsessions_sql: executing external command ,,/usr/lib/x2go/libx2go-server-db-sqlite3-wrapper'' with args: listsessionsroot,ServeurITeN
Mar 15 12:56:19 ServeurITeN x2golistsessions_sql: executing external command ,,x2gopath'' with args: libexec
Mar 15 12:56:19 ServeurITeN x2golistsessions_sql: executing external command ,,/usr/lib/x2go/libx2go-server-db-sqlite3-wrapper'' with args: listsessionsroot,ServeurITeN
Mar 15 12:56:21 ServeurITeN x2golistsessions_sql: executing external command ,,x2gopath'' with args: libexec
Mar 15 12:56:22 ServeurITeN x2golistsessions_sql: executing external command ,,/usr/lib/x2go/libx2go-server-db-sqlite3-wrapper'' with args: listsessionsroot,ServeurITeN
Mar 15 12:56:24 ServeurITeN x2golistsessions_sql: executing external command ,,x2gopath'' with args: libexec
Mar 15 12:56:24 ServeurITeN x2golistsessions_sql: executing external command ,,/usr/lib/x2go/libx2go-server-db-sqlite3-wrapper'' with args: listsessionsroot,ServeurITeN
Mar 15 12:56:26 ServeurITeN x2golistsessions_sql: executing external command ,,x2gopath'' with args: libexec
Mar 15 12:56:26 ServeurITeN x2golistsessions_sql: executing external command ,,/usr/lib/x2go/libx2go-server-db-sqlite3-wrapper'' with args: listsessionsroot,ServeurITeN
Mar 15 12:56:28 ServeurITeN x2golistsessions_sql: executing external command ,,x2gopath'' with args: libexec
Mar 15 12:56:28 ServeurITeN x2golistsessions_sql: executing external command ,,/usr/lib/x2go/libx2go-server-db-sqlite3-wrapper'' with args: listsessionsroot,ServeurITeN
Mar 15 12:56:30 ServeurITeN x2golistsessions_sql: executing external command ,,x2gopath'' with args: libexec
Mar 15 12:56:30 ServeurITeN x2golistsessions_sql: executing external command ,,/usr/lib/x2go/libx2go-server-db-sqlite3-wrapper'' with args: listsessionsroot,ServeurITeN
Mar 15 12:56:33 ServeurITeN x2golistsessions_sql: executing external command ,,x2gopath'' with args: libexec
Mar 15 12:56:33 ServeurITeN x2golistsessions_sql: executing external command ,,/usr/lib/x2go/libx2go-server-db-sqlite3-wrapper'' with args: listsessionsroot,ServeurITeN
Mar 15 12:56:35 ServeurITeN x2golistsessions_sql: executing external command ,,x2gopath'' with args: libexec
Mar 15 12:56:35 ServeurITeN x2golistsessions_sql: executing external command ,,/usr/lib/x2go/libx2go-server-db-sqlite3-wrapper'' with args: listsessionsroot,ServeurITeN

ServeurITeN is the name of the machine. I have not been trying to connect with x2go to this machine since the last reboot. Does it look like it's trying to execute something that fails constantly ?

Manfred A.