Removal of the package 'sabily-gdm-themes' and rebooting had no effect
on my situation.
Daniel, perhaps you have some insight into this. What information I've found
in my internet search says that gdm/gdm3 defaults to Adwaita icon theme. I'm
looked for "how to configure" type articles
about gd
Adding MUTTER_DEBUG_DISABLE_HW_CURSORS=1 to /etc/environment and
rebooting had no effect on the issue. White square "mouse pointer" is
present on gdm login screen if /usr/share/icons/adwaita/cursors is
missing (renamed).
If instead I install a symbolic link .../Adwaita/cursors -> .../Yaru/cursors
The reported problem is during login, not after successful login.
I don't think mutter configuration has any effect before graphical login.
Ubuntu's cursor theme may come from 'yaru-theme-icon', but does gdm's?
Two files affect the observed condition:
/usr/share/icons/Adwaita/cursors/left_ptr
/u
