On x2gothinclients, when a usb-disk is added, the / media folder is created in the client's home directory, and the name of the inserted disk appears for a second in the / rm folder, and then disappears. Writes to / var / log / usb that the disk is mounted. The / syslog also contains an entry about the mounted disk, but judging by the x2gousbmount script, a file should also appear in /var/run/sdb1.mounted, which is not there.
There is a disk in the / media root, but the files are not there.
P.S. At the first mount, the usb-disk was, but did not show the files, as if it was empty. On next reconnections, the disk no longer appears. Other discs behave the same way.
6 11:48:24 debian systemd[840]: run-user-1015-gvfs.mount: Succeeded.
Jul 6 11:48:24 debian systemd[838]: run-user-1015-gvfs.mount: Succeeded.
Jul 6 11:48:24 debian systemd[1024]: run-user-1015-gvfs.mount: Succeeded.
Jul 6 11:48:24 debian systemd[836]: run-user-1015-gvfs.mount: Succeeded.
Jul 6 11:48:24 debian systemd[834]: run-user-1015-gvfs.mount: Succeeded.
Jul 6 11:48:24 debian systemd[837]: run-user-1015-gvfs.mount: Succeeded.
Jul 6 11:48:24 debian systemd[1]: run-user-1015-gvfs.mount: Succeeded.
Jul 6 11:48:24 debian systemd[833]: run-user-1015-gvfs.mount: Succeeded.
Jul 6 11:48:36 debian systemd[1]: session-307.scope: Succeeded.
Jul 6 11:48:47 debian systemd[1]: Started Session 315 of user tb.
Jul 6 11:48:50 debian /usr/sbin/x2gocleansessions[986]: tb-51-1625561329_stDMATE_dp24: state file for this session does not exist: /tmp/.x2go-tb/C-tb-51-1625561329_stDMATE_dp24/state (this can be ignored during session startups)
Jul 6 11:48:51 debian /usr/bin/x2gostartagent: successfully started X2Go Agent session with ID tb-51-1625561329_stDMATE_dp24
Jul 6 11:48:53 debian systemd[834]: tmp-.x2go\x2dtb-spool-C\x2dtb\x2d51\x2d1625561329_stDMATE_dp24.mount: Succeeded.
Jul 6 11:48:53 debian systemd[1024]: tmp-.x2go\x2dtb-spool-C\x2dtb\x2d51\x2d1625561329_stDMATE_dp24.mount: Succeeded.
Jul 6 11:48:53 debian systemd[58140]: tmp-.x2go\x2dtb-spool-C\x2dtb\x2d51\x2d1625561329_stDMATE_dp24.mount: Succeeded.
Jul 6 11:48:53 debian systemd[840]: tmp-.x2go\x2dtb-spool-C\x2dtb\x2d51\x2d1625561329_stDMATE_dp24.mount: Succeeded.
Jul 6 11:48:53 debian systemd[838]: tmp-.x2go\x2dtb-spool-C\x2dtb\x2d51\x2d1625561329_stDMATE_dp24.mount: Succeeded.
Jul 6 11:48:53 debian systemd[837]: tmp-.x2go\x2dtb-spool-C\x2dtb\x2d51\x2d1625561329_stDMATE_dp24.mount: Succeeded.
Jul 6 11:48:53 debian systemd[1]: tmp-.x2go\x2dtb-spool-C\x2dtb\x2d51\x2d1625561329_stDMATE_dp24.mount: Succeeded.
Jul 6 11:48:53 debian systemd[833]: tmp-.x2go\x2dtb-spool-C\x2dtb\x2d51\x2d1625561329_stDMATE_dp24.mount: Succeeded.
Jul 6 11:48:53 debian systemd[836]: tmp-.x2go\x2dtb-spool-C\x2dtb\x2d51\x2d1625561329_stDMATE_dp24.mount: Succeeded.
Jul 6 11:48:53 debian /usr/bin/x2gomountdirs[33362]: WARNING: mounting of /var/lib/x2gothinclient/.x2go/S-tb-51-1625561329_stDMATE_dp24/spool failed
Jul 6 11:48:53 debian /usr/bin/x2goruncommand: launching session with Xsession-x2go mechanism, using STARTUP="mate-session"
Jul 6 11:48:53 debian /usr/bin/x2goruncommand: dbus wrapper available as /usr/bin/dbus-run-session
Jul 6 11:48:55 debian mate-session[33552]: WARNING: Unable to find provider '' of required component 'dock'
Jul 6 11:48:55 debian systemd[837]: Starting Sound Service...
.....
Jul 6 12:03:07 debian systemd[836]: tmp-.x2go\x2dtb-media-rm-_media__USB_DISK_30X_sdb1.mount: Succeeded.
Jul 6 12:03:07 debian systemd[840]: tmp-.x2go\x2dtb-media-rm-_media__USB_DISK_30X_sdb1.mount: Succeeded.
Jul 6 12:03:07 debian systemd[1]: tmp-.x2go\x2dtb-media-rm-_media__USB_DISK_30X_sdb1.mount: Succeeded.
Jul 6 12:03:07 debian systemd[1024]: tmp-.x2go\x2dtb-media-rm-_media__USB_DISK_30X_sdb1.mount: Succeeded.
Jul 6 12:03:07 debian systemd[833]: tmp-.x2go\x2dtb-media-rm-_media__USB_DISK_30X_sdb1.mount: Succeeded.
Jul 6 12:03:07 debian systemd[834]: tmp-.x2go\x2dtb-media-rm-_media__USB_DISK_30X_sdb1.mount: Succeeded.
Jul 6 12:03:07 debian systemd[58140]: tmp-.x2go\x2dtb-media-rm-_media__USB_DISK_30X_sdb1.mount: Succeeded.
Jul 6 12:03:07 debian systemd[837]: tmp-.x2go\x2dtb-media-rm-_media__USB_DISK_30X_sdb1.mount: Succeeded.
Jul 6 12:03:07 debian systemd[838]: tmp-.x2go\x2dtb-media-rm-_media__USB_DISK_30X_sdb1.mount: Succeeded.
Jul 6 12:03:07 debian systemd[834]: tmp-.x2go\x2dtb-media-rm-_media__USB_DISK_30X_multisystem.mount: Succeeded.
Jul 6 12:03:07 debian systemd[833]: tmp-.x2go\x2dtb-media-rm-_media__USB_DISK_30X_multisystem.mount: Succeeded.
Jul 6 12:03:07 debian systemd[1024]: tmp-.x2go\x2dtb-media-rm-_media__USB_DISK_30X_multisystem.mount: Succeeded.
Jul 6 12:03:07 debian systemd[840]: tmp-.x2go\x2dtb-media-rm-_media__USB_DISK_30X_multisystem.mount: Succeeded.
Jul 6 12:03:07 debian systemd[1]: tmp-.x2go\x2dtb-media-rm-_media__USB_DISK_30X_multisystem.mount: Succeeded.
Jul 6 12:03:07 debian systemd[58140]: tmp-.x2go\x2dtb-media-rm-_media__USB_DISK_30X_multisystem.mount: Succeeded.
Jul 6 12:03:07 debian systemd[838]: tmp-.x2go\x2dtb-media-rm-_media__USB_DISK_30X_multisystem.mount: Succeeded.
Jul 6 12:03:07 debian systemd[836]: tmp-.x2go\x2dtb-media-rm-_media__USB_DISK_30X_multisystem.mount: Succeeded.
Jul 6 12:03:07 debian systemd[837]: tmp-.x2go\x2dtb-media-rm-_media__USB_DISK_30X_multisystem.mount: Succeeded.
Jul 6 12:03:07 debian /usr/bin/x2gomountdirs[41896]: WARNING: mounting of /media/_USB_DISK_30X/sdb1 failed
Jul 6 12:03:07 debian /usr/bin/x2gomountdirs[41895]: WARNING: mounting of /media/_USB_DISK_30X/multisystem failed