A general question: If I think I've added wrong apt-repository and installed wrong GPU drivers, what I should do?
About my situation: I have Kubuntu 19.04 and AMD R9 280X (HD 7970/8970). Because I had some graphic issues I tried to (re)install drivers.
I found another askubuntu question and I followed step-by-steps. One package was missing while following steps, so I started to install it but then I noticed the missing package (what I already started to install) was GDM3 (GNOME Display Manager). I saw my mistake, and removed it.
I know, "check first what you are installing". I'm still new with these stuff...
Now I afraid I've done something wrong so my system will not properly boot or I get other errors after restarting my PC. So I wanted to ask some tips from you guys before doing more damage (if I even made any).
My GPU related apk-repositories in /etc/apt/sources.list.d/
graphics-drivers-ubuntu-ppa-disco.list
graphics-drivers-ubuntu-ppa-disco.list.save
oibaf-ubuntu-graphics-drivers-disco.list
oibaf-ubuntu-graphics-drivers-disco.list.save
paulo-miguel-dias-ubuntu-mesa-bionic.list
paulo-miguel-dias-ubuntu-mesa-bionic.list.distUpgrade
paulo-miguel-dias-ubuntu-mesa-bionic.list.save
paulo-miguel-dias-ubuntu-pkppa-bionic.list
paulo-miguel-dias-ubuntu-pkppa-bionic.list.distUpgrade
paulo-miguel-dias-ubuntu-pkppa-bionic.list.save
paulo-miguel-dias-ubuntu-pkppa-disco.list
The correct apt-repository what I think I need is ppa:paulo-miguel-dias/pkppa (stable).
sudo lshw -c video shows driver=radeon which (I think) is correct
sudo lshw -c video
*-display
description: VGA compatible controller
product: Tahiti XT [Radeon HD 7970/8970 OEM / R9 280X]
vendor: Advanced Micro Devices, Inc. [AMD/ATI]
physical id: 0
bus info: pci@0000:01:00.0
version: 00
width: 64 bits
clock: 33MHz
capabilities: pm pciexpress msi vga_controller bus_master cap_list rom
configuration: driver=radeon latency=0
resources: irq:27 memory:e0000000-efffffff memory:f7e00000-f7e3ffff ioport:e000(size=256) memory:c0000-dffff
I tried to grep installed packages, but I don't know (and didn't find) a suitable command for this.
