Use calamares as kubuntu installer

[soredake]

By using calamares 3 bugs can be fixed:
https://bugs.launchpad.net/ubuntu/+source/ubiquity/+bug/1915594
https://bugs.launchpad.net/ubuntu/+source/ubiquity/+bug/1915596
https://bugs.launchpad.net/ubuntu/+source/ubiquity/+bug/1915597

[Omer I.S. (omeritzics-deactivatedaccount)]

Kubuntu already uses Calamares as the Kubuntu installer.

[Omer I.S. (omeritzics-deactivatedaccount)]

(I am very sorry, Kubuntu uses only the same front-end as Calamares)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Your name as you would like it displayed throughout Launchpad (plutoisnolongeraplanet-deactivatedaccount-deactivatedaccount)]

Calamares doesn't have an option to leave /boot unencrypted (the way Kubuntu/Ubiquity does currently), which causes some problems:

https://github.com/calamares/calamares/issues/1311#issue-556802034
https://github.com/calamares/calamares/issues/1311#issuecomment-834167109

An option will be add and the pull request is yet to be made. I think the switch should happen only after the implementation of this option.

[Your name as you would like it displayed throughout Launchpad (plutoisnolongeraplanet-deactivatedaccount-deactivatedaccount)]

an option will be added to leave /boot unencrypted*

Edit: using Calamares would help to these major bugs too:

https://bugs.launchpad.net/ubuntu/+source/ubiquity/+bug/1510731
https://bugs.launchpad.net/ubuntu/+source/ubiquity/+bug/1510730

[Omer I.S. (omeritzics-deactivatedaccount)]

+1
Using Calamares can fix bug #1928559.

[Your name as you would like it displayed throughout Launchpad (plutoisnolongeraplanet-deactivatedaccount-deactivatedaccount)]

And it would fix this one too:
https://bugs.launchpad.net/ubuntu/+source/ubiquity/+bug/1931773

I also proposed a switch to ubiquity-frontend-gtk:
https://bugs.launchpad.net/ubuntu/+source/ubiquity/+bug/1930223