Linux desktop client does not work

As far as I know, a “program.appimage” should run on any Linux distribution out of the box, because it contains all libraries and solves every dependency. But the client package provided at “” does not work on Knoppix:

$ ./Nextcloud-2.6.1-x86_64.AppImage

Nextcloud-2.6.1-x86_64.AppImage: error while loading shared libraries: cannot open shared object file: No such file or directory

So, how can I get the client to work?

Did you try to install libz ?

No, I didn’t, because as far as I know, the Nextcloud.AppImage should bring everything, that is needed.