Hi,
I get the same issue: Installed Ubuntu 21.10 and insync is not starting anymore.
Here are the asked logs:
Warning: Ignoring XDG_SESSION_TYPE=wayland on Gnome. Use QT_QPA_PLATFORM=wayland to run on Wayland anyway.
(insync:9758): GLib-GIO-ERROR **: 09:24:54.195: Settings schema 'org.gnome.settings-daemon.plugins.xsettings' does not contain a key named 'antialiasing'
The first workarround didn’t work for me, but the following one did:
env GDK_BACKEND=x11 insync start