this bug is caused by using a later version of mutter. for example if I install gnome-shell from a ppa it also updates mutter to 2.31.2 so when unity session is started I get a white screen then downgrading mutter packages to 2.90 (from unity ppa) makes unity working again
this bug is caused by using a later version of mutter. for example if I install gnome-shell from a ppa it also updates mutter to 2.31.2 so when unity session is started I get a white screen then downgrading mutter packages to 2.90 (from unity ppa) makes unity working again