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Information about the server won’t help here, the desktop appimage can’t even try to connect.
The Desktop Appimage 4.0.5 for Linux jumps off the ladder with
bin/Nextcloud-4.0.5-x86_64.AppImage
bin/Nextcloud-4.0.5-x86_64.AppImage: symbol lookup error: /tmp/.mount_NextcliHdFCH/usr/bin/../lib/libgobject-2.0.so.0: undefined symbol: g_string_copy
sha256sum bin/Nextcloud-4.0.5-x86_64.AppImage
cf2fe471ff69cb26e8af229977b74337d8f3f68920da47beb5ff74e11b77fa59 bin/Nextcloud-4.0.5-x86_64.AppImage
The 4.0.4 worked like a charm.
System: An actual Linux Mint
Linux gong 6.8.0-90-generic #91-Ubuntu SMP PREEMPT_DYNAMIC Tue Nov 18 14:14:30 UTC 2025 x86_64 x86_64 x86_64 GNU/Linux
Permissions are OK, I simply switched back to 4.0.4.
This is just a hint, I intentionally kept it short.