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Digikam is a snap and like most snaps it doesn't anything outside home by default. Assuming you installed it via Ubuntu Software you can open again its page, click the big red button "Permissions"...

That being the case then I suggest you boot a live session, backup your personal files and then reinstall.

Gparted is as easy as the OSX Disk Utility, the tool that you probably used to create the (unneeded and unusable) partitions in the first place. The same way you created them you can also delete,...

Xubuntu 18.04 will be out of support in April (flavor only get 3 years instead of 5 for a standard Ubuntu LTS).
Knowing that I suggest you install Xubuntu 20.04, supported until 2023. There's no...

[ 0.819698] Kernel panic-not syncing:IOAPIC+timer doesn't work Boot
with apic=debug and send a report. Then try booting with the 'noapic' option.

If using the old BIOS boot then in the same...

Very likely it has nothing to do with KDE Connect in the desktop PC but with Android permissions of the KDE Connect app.

Don't know about laser engravers but 3D printers are, for the most part, OS agnostic and the software required for making the files to be printed exist for all platforms.

But all of this is...

Wiping the whole drive, create a new partition table, etc. can be done within the Ubuntu live session among many other things. That shouldn't be necessary to repair or reinstall Windows though. And...

Any properly made Windows USB media should work. Typically when done with the Windows Media Creation tool it always works, never had a problem with those.

Maybe you aren't doing it right. maybe is about permissions... I don't know.

You can try GParted > Device > Create partition table (choose GPT). This surely works because it runs as root. Then you...

Well, considering you just installed, why not install again?
And then NOT "uninstall some things" because of the WiFi. If you're having problems ask here first.

Unallocated space means no partition. You simply delete the two partitions you said you created for Ubuntu thus leaving that space unallocated.
And no, you don't need to use MacOS for that. You can...

Please add pictures as attachments, not as pictures.

Now, you don't need and probably shouldn't create partitions for Ubuntu but instead have unallocated space. No swap partition needed either...

It runs in newer versions but may need additional packages: https://support.storagecraft.com/s/article/DTX-Fails-to-run-in-Ubuntu-18-04-or-20-04?language=en_US

It was just a matter of googling...

Welcome.

Ubuntu 18.04 - there's no "Ubuntu 18" - is still supported and will be until April 2023.
Ubuntu 16.04 - there's no "Ubuntu 16" - will be out of support next April. No point in installing...

Are you selecting to "erase and install.." or did you partitioned in advance? If so, did you created the EFI partition?

Does it have Windows?

https://askubuntu.com/questions/1294853/cannot-update-software-because-of-grub-efi-amd64-signed-unmet-dependency

First you say then ???

Those aren't all the options. If you partitioned in advance you need to choose "something else" and then select all the required partitions including the ESP (EFI System...

https://www.mathworks.com/matlabcentral/answers/518584-how-do-i-install-on-ubuntu

The easiest way is to use sync with a Firefox account.
Without it and manually you can always copy over and replace the hidden folder where such settings are stored: https://askubuntu.com/a/218451...

Try disabling Fast Boot (UEFI) and also make sure, if applicable, Legacy USB support IS enabled.

I suggest you test it in a live session.

Does it work in UEFI? If so, does it work in Windows if booted directly?

No, it is not only compatible with those brands.
It is guaranteed to work with - some brands have whitelists for such parts or are just very picky - but in no way limited to.