Restore kubuntu login manager

[Sarunas Burdulis]

On 12/2/22 00:24, Jeffrey Walton wrote:
> Hi Everyone,
> 
> I tried to fix my Clang install on Kubuntu/Jammy after a
> do-system-upgrade.[1] When I removed some old and unused GCC packages,
> it blew away some of the GUI stuff, like the greeter and login
> manager. Looking at bash history, I performed `apt remove --purge
> gcc-9* gcc-10* gcc-12*`. I did not record what packages were removed,
> but it cut deeper than expected.
> 
> I did some fiddling in an attempt to repair the login gear. I've
> gotten as far as the two screen shots at [2,3]. Obviously, they are
> wrong. Especially the big Soft Input Panel (SIP) - this is a desktop
> computer and not a laptop. Looking at bash history, they are the
> result of (re?)installing kde-plasma-desktop and lightdm-kde-greeter.
> 
> How do I get this system back to its upgraded state with the expected
> login manager and behaviors?

I think Kubuntu login manager is SDDM. Packages are sddm and 
kde-config-sddm (applet for System Settings). There are also several 
sddm-theme-... theme packages.

You may have SDDM installed already, but not being used. You can do 
`dpkg-reconfigure -plow sddm` to set what your default login manager is.

> [2] https://imgur.com/a/PzxO06d
> [3] https://imgur.com/a/LOFSE2u

lightdm-kde-greeter doesn't seem to exist. You probably are looking at 
lightdm-gtk-greeter...

-- 
Sarunas Burdulis
Dartmouth Mathematics
math.dartmouth.edu/~sarunas

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