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I have Ubuntu 16.04:

root@ubuntu:~# lsb_release -a

No LSB modules are available.

Distributor ID: Ubuntu

Description:    Ubuntu 16.04.5 LTS

Release:    16.04

Codename:   xenial



root@ubuntu:~# uname -a

Linux ubuntu 4.15.0-45-generic #48~16.04.1-Ubuntu SMP Tue Jan 29 18:03:48 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux

I had problems with the GUI desktop that wasn't loading so I installed it with aptitude:

aptitude install ubuntu-desktop 

But after the GUI is loaded there is only the desktop without the bar and all the menus and I can't moveresize the windows.

I tried to reinstall ubuntu-desktop with apt-get but it failed:

root@ubuntu:~# apt-get install --reinstall ubuntu-desktop

Reading package lists... Done

Building dependency tree       

Reading state information... Done

Some packages could not be installed. This may mean that you have

requested an impossible situation or if you are using the unstable

distribution that some required packages have not yet been created

or been moved out of Incoming.

The following information may help to resolve the situation:



The following packages have unmet dependencies:

 ubuntu-desktop : Depends: unity but it is not going to be installed

                  Recommends: network-manager-gnome but it is not going to be installed

                  Recommends: snapd but it is not going to be installed

E: Unable to correct problems, you have held broken packages.

The current version installed:

root@ubuntu:~# apt-cache policy ubuntu-desktop

ubuntu-desktop:

  Installed: (none)

  Candidate: 1.361

  Version table:

     1.361 500

        500 http://us.archive.ubuntu.com/ubuntu xenial/main amd64 Packages

I restored the /etc/apt/source.list file by this answer.

This is the source.list in my case:

#------------------------------------------------------------------------------#

#                            OFFICIAL UBUNTU REPOS                             #

#------------------------------------------------------------------------------#



###### Ubuntu Main Repos

deb http://il.archive.ubuntu.com/ubuntu/ xenial main restricted universe multiverse 

deb-src http://il.archive.ubuntu.com/ubuntu/ xenial main restricted universe multiverse 



###### Ubuntu Update Repos

deb http://il.archive.ubuntu.com/ubuntu/ xenial-security main restricted universe multiverse 

deb http://il.archive.ubuntu.com/ubuntu/ xenial-updates main restricted universe multiverse 

deb-src http://il.archive.ubuntu.com/ubuntu/ xenial-security main restricted universe multiverse 

deb-src http://il.archive.ubuntu.com/ubuntu/ xenial-updates main restricted universe multiverse 



###### Ubuntu Partner Repo

deb http://archive.canonical.com/ubuntu xenial partner

deb-src http://archive.canonical.com/ubuntu xenial partner



deb http://us.archive.ubuntu.com/ubuntu/ xenial main universe restricted multiverse

deb http://security.ubuntu.com/ubuntu/ xenial-security multiverse universe restricted main

deb http://us.archive.ubuntu.com/ubuntu/ xenial-updates multiverse universe restricted main

After running apt-get update I was able to run apt-get install --reinstall ubuntu-desktop and then rebooted the machine.

Now everything is back to normal.