After upgrade ubuntu 18.04 changed from GUI to Terminal

Question

After upgrading from Ubuntu 17.10 to 18.04 I am not able to login to the desktop environment. This screen shows after restarting:

Solution 1

Your OS is not properly installed. Try the following:

exec sudo -i
dpkg --configure -a
apt-get -f install
apt-get update
apt-get dist-upgrade
apt-get install --reinstall ubuntu-desktop
apt-get autoremove
apt-get clean

If it doesn't work, reinstall Ubuntu. Follow this to reinstall the OS without loosing data. The post is about Ubuntu 16.04 LTS but it'll also work for Ubuntu 18.04 LTS.

Solution 2

In my case

sudo apt install lightdm

solved the problem.

See also:

• No GUI after Kubuntu 18.04 LTS upgrade from 17.10

Comments

[Hartmut Pfarr]

In my case this alone did not work, since I was migrating from 17.10 gdm3. As described in the solution of Murmel below, I've got it fixed now by "sudo apt install lightdm" and decide gdm3 as window manager, when the popup appears (gdm3 or lightdm)

[Hartmut Pfarr]

I've been migrating from 17.10 gdm3, Your solution did the trick! I did "sudo apt install lightdm" and decided "gdm3" as window manager, when the popup appeared (gdm3 or lightdm)