Как я могу переключиться от Kubuntu 18.04 до Ubuntu 18.04?

Я использую Kubuntu, но я хочу установить Рабочий стол Ubuntu и хотеть использовать его, так или иначе я не могу установить. Кто-либо мог помочь мне?

Я попробовал эту команду:

sudo apt install ubuntu-desktop

Вывод:

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: gdm3 but it is not going to be installed
                  Recommends: ibus
                  Recommends: ibus-table but it is not going to be installed
                  Recommends: shotwell but it is not going to be installed
E: Unable to correct problems, you have held broken packages.

apt update
All packages are up to date.

apt upgrade 
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.

apt-cache policy ubuntu-desktop gdm3 ibus ibus-table shotwell
ubuntu-desktop:
  Installed: (none)
  Candidate: 1.417
  Version table:
     1.417 500
        500 http://archive.ubuntu.com/ubuntu bionic/main amd64 Packages
gdm3:
  Installed: (none)
  Candidate: 3.28.0-0ubuntu1
  Version table:
     3.28.0-0ubuntu1 500
        500 http://archive.ubuntu.com/ubuntu bionic/main amd64 Packages
ibus:
  Installed: (none)
  Candidate: 1.5.17-3ubuntu4
  Version table:
     1.5.17-3ubuntu4 500
        500 http://archive.ubuntu.com/ubuntu bionic/main amd64 Packages
ibus-table:
  Installed: (none)
  Candidate: 1.9.14-3
  Version table:
     1.9.14-3 500
        500 http://archive.ubuntu.com/ubuntu bionic/main amd64 Packages
        500 http://archive.ubuntu.com/ubuntu bionic/main i386 Packages
shotwell:
  Installed: (none)
  Candidate: 0.28.2-0ubuntu1
  Version table:
     0.28.2-0ubuntu1 500
        500 http://archive.ubuntu.com/ubuntu bionic/main amd64 Packages