fix crouton Xorg.crouton.*.log error without reboot
just
$ sudo rm /tmp/Xorg.crouton.*
Tada ! It's work again
just
$ sudo rm /tmp/Xorg.crouton.*
Tada ! It's work again
show all installed chroot
$ sudo edit-chroot -a
delete chroot which one you want never see it
$ sudo edit-chroot -d chrootname
>default chroot name should be xenial