qt.qpa.plugin: Could not find the Qt platform plugin "wayland" in ""
nextcloud.gui.application: Migrating old config from "/home/XxX/.local/share/Nextcloud" to "/home/XxX/.config/Nextcloud"
nextcloud.gui.application: Failed to move the old config directory to its new location ( "/home/XxX/.local/share/Nextcloud" to "/home/XxX/.config/Nextcloud" )
nextcloud.gui.application: Will move the individual files QList("Nextcloud_sync.log")
nextcloud.gui.application: Fallback move of "Nextcloud_sync.log" also failed
Gtk-Message: 12:39:36.177: Not loading module "atk-bridge": The functionality is provided by GTK natively. Please try to not load it.
libatk-adaptor, libgail-common, qtwayland5 are installed.
Ubuntu does provide packages of the Nextcloud desktop client through their Universe repositories, but these packages are usually already somewhat out of date by the time a particular version of Ubuntu is released, and they don’t get updates during the lifetime of a release: Ubuntu – Package Search Results -- nextcloud-desktop