Sorry, Ubuntu 18.04 has experienced an internal error (UI is not update to 18.04)

Here are screenshots of error.

Its hows that its is updated to 18.04 but the UI is of 16.04

Solution 1:

The name of the meta-package for unity changed to ubuntu-unity-desktop It's moved to universe. ubuntu-desktop Meta package points now to gnome3

If you really have both on your System decide which desktop you want. Both together is not a smart idea. They have influence among one another. check it first.

dpkg -l | egrep 'unity|gnome'

For removing unity sudo apt-get autoremove --purge ubuntu-unity-desktop unity and to install the right meta-package sudo apt install --reinstall ubuntu-desktop

For remove gnome3 sudo apt-get autoremove --purge ubuntu-desktop gnome-shell and sudo apt install --reinstall ubuntu-unity-desktop