Operating System: Kubuntu 20.04
KDE Plasma Version: 5.18.5
KDE Frameworks Version: 5.68.0
Qt Version: 5.12.8
Kernel Version: 5.4.0-65-generic
OS Type: 64-bit
Processors: 4 × Intel® Core™ i7-4510U CPU @ 2.00GHz
Memory: 7.7 GiB of RAM

Graphics Processor: GeForce 840M
NVIDIA Driver Version: 460.32.03
Laptop screen: 1280 x 720

Global theme: Kubuntu
Plasma style: Kubuntu
Fonts : Noto Sans 12 pt
GNOME/GTK app style: Adwaita
-------------------------------------------------------

Firstly, I must say that for every prior version of Kubuntu, I have NEVER had to change fonts, themes, display properties. It always worked just fine out of the box. But with 20.04, the problems appeared.

I had to do a lot of research, changing themes, fonts, etc, new themes, addressing problems with GTK based apps, installing Nvidia drivers (which I have never had to do), and it was basically okay up until a few days ago. Then just booted and it was all a mess again, what caused that I have no idea. The fonts are much larger and not much fits into the display now.

There was a hardware device application update, not sure if that had any bearing ? Why I mention that is because I did have Nvidia 455 driver installed, yet when I did a

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ubuntu-drivers devices

it recommended 460. So that got installed, no difference though. I even installed "gnome-tweaks" in desparation ..lol

There is only one GTK applications I run, Claws-Mail. That has its own theme, fonts setting, yet even that got totally messed up, huge fonts, a real mess.

Now, to some questions:

1. Do I really need to Nvidia driver ? I ask that because I have not had to install it in prior releases.

2. Is there a method I can use to, the KIS principle would be nice. For instance, why can't I just have a system wide theme, font, colour,etc setting and ALL applications use that ? I say that because I have had to modify Terminal, OpenOffice, Kate, Dolphin,etc,etc, in regards to fonts. That was all basically okay, but now a mess again.

From

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journalctl -b

kernel: MDS CPU bug present and SMT on, data leak possible.
kernel: i2c_hid i2c-DLL0653:00: i2c-DLL0653:00 supply vdd not found, using dum>
kernel: i2c_hid i2c-DLL0653:00: i2c-DLL0653:00 supply vddl not found, using du>
kernel: wmi_bus wmi_bus-PNP0C14:01: WQBC data block query control method not f>
kernel: r8169 0000:07:00.0: can't disable ASPM; OS doesn't have ASPM control
kernel: nvidia: loading out-of-tree module taints kernel.
kernel: nvidia: module license 'NVIDIA' taints kernel.
kernel: Disabling lock debugging due to kernel taint
kernel: NVRM: loading NVIDIA UNIX x86_64 Kernel Module  460.32.03  Sun Dec 27
kernel: [Firmware Bug]: ACPI(PEGP) defines _DOD but not _DOS
kernel: No Local Variables are initialized for Method [_BCL]
kernel: No Arguments are initialized for method [_BCL]
unknown: Started bpfilter
kernel: dell-smbios A80593CE-A997-11DA-B012-B622A1EF5492: WMI SMBIOS userspace
sddm[878]: Initializing...
sddm[878]: Starting...
sddm[878]: Logind interface found
sddm[878]: Adding new display on vt 1 ...
kernel: ACPI BIOS Error (bug): Could not resolve symbol [\_SB.PCI0.GFX0.DD02._>
kernel: ACPI Error: Aborting method \_SB.PCI0.RP05.PEGP.DD02._BCL due to previ>
org.kde.KScreen[1581]: kscreen.xrandr: Connected output 475 to CRTC 472
org.kde.KScreen[1581]: kscreen.xcb.helper: Detected XRandR 1.6
org.kde.KScreen[1581]: kscreen.xcb.helper: Event Base:  89
org.kde.KScreen[1581]: kscreen.xcb.helper: Event Error:  147
org.kde.KScreen[1581]: kscreen.xcb.helper: RRScreenChangeNotify
org.kde.KScreen[1581]: kscreen.xcb.helper:         Window: 27262981
org.kde.KScreen[1581]: kscreen.xcb.helper:         Root: 549
org.kde.KScreen[1581]: kscreen.xcb.helper:         Rotation:  "Rotate_0"
org.kde.KScreen[1581]: kscreen.xcb.helper:         Size ID: 65535
org.kde.KScreen[1581]: kscreen.xcb.helper:         Size:  1366 768
org.kde.KScreen[1581]: kscreen.xcb.helper:         SizeMM:  341 191
org.kde.KScreen[1581]: kscreen.xrandr: Emitting configChanged()
org.kde.KScreen[1581]: kscreen.xrandr: XRandR::setConfig
   (Pages of "KScreen"  messages )


Is the "kernel taint" serious ?