The error at the bottom of DpkgTerminalLog.txt looks like either disk corruption or just network corruption in downloading the update.
-- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xorg-server in Ubuntu. https://bugs.launchpad.net/bugs/1987169 Title: package xserver-xorg-legacy 2:1.20.13-1ubuntu1~20.04.3 failed to install/upgrade: installed xserver-xorg-legacy package post- installation script subprocess returned error exit status 255 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1987169/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : [email protected] Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp

