New answers tagged x-server
First find out the appropriate section by lsblk. I did by following here in the GUI sudo mkdir /mnt/foo sudo mount /dev/sda2 /mnt/foo sudo mount --bind /dev /mnt/foo/dev && sudo mount --bind /dev/pts /mnt/foo/dev/pts && sudo mount --bind /proc /mnt/foo/proc && sudo mount --bind /sys /mnt/foo/sys sudo chroot /mnt/foo sudo apt-get ...
No mention of Xubuntu/Xfce versions nor hardware so it's all a stab in the dark. Clearly a look through the logs may help. Seem to remember lots of issues with light locker and screen locking. Try disabling that for starters.
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