[X2Go-User] Updating from X2Go's Debian repository fails due to GPG error NO_PUBKEY F4A7678C9C6B0B2B

[Holger Krause]

Dear list,

since last night running 'aptitude update' gives an error on a machine with 
X2Go's Debian repository added:

W: An error occurred during the signature verification. The repository is not 
updated and the previous index files will be used. GPG error: 
http://packages.x2go.org jessie InRelease: The following signatures couldn't 
be verified because the public key is not available: NO_PUBKEY 
F4A7678C9C6B0B2B

According to http://wiki.x2go.org/doku.php/wiki:repositories:debian I would 
expect the file to be signed with key E1F958385BFE2B6E. Has the key to sign 
the repository been changed by the project?

Looking forward to receiving any feedback!

Best,

Holger