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I would suggest you double-check the Secure Boot status and disable it if enabled.
If it doesn't solve the problem then please run and post back the error messages resulting from the command...

Please post the hardware specifications, particularly the graphics.

Start with updating the UEFI.

No specialist would say that.
Either it's possible to toggle or enable/disable the dGPU Nvidia and use the iGPU Intel in UEFI ("BIOS") or, if not, the only option is to toggle via software, i.e. by...

Yes, it seems Audacity wants local files only. It actually makes sense.

Your hardware is definitely defective.

IF you can switch then at Nvidia X Server Settings it should show both profiles. Change and reboot.

The above notwithstanding, if you installed the Audacity via snap then like any other snap the default is local access only. Please open the software app, search Audicity and if it is a snap you'll...

Welcome.

Lubuntu.net isn't the official Lubuntu website, Lubuntu.me is.
Please always check at https://ubuntu.com/download/flavours to avoid being duped.

When we understand that snaps are to be installed via the software store and that right after installation there's a huge red Permission button, everything should be self-explanatory after clicking...

F12 is not the Grub menu, it's the one-time UEFI boot menu. That you CAN boot Ubuntu (Grub) from it means that everything is fine except you still have Windows as the boot default in UEFI Settings >...

Yes, but you must be very careful about what you're running simultaneously.

Have you selected the option to install third-party drivers, etc.?

It's quite obvious that you have deeper issues than installing Virtualbox.
Yes, please reinstall and avoid messing with things you don't understand enough of yet. When in doubt ask first here, we're...

You can use an external USB drive with USB2.0 or USB3.0, the difference is the former will be much slower.

Do you have all the normal repos enabled? Please check that first.
And have you been messing with python? The error messages are worrisome, they suggest you have a very broken system.

So should we assume there were no errors reported and the system is fully updated?
If so please run 'gnome-software' in terminal and post back the error messages in full.

Make sure the system is fully updated by terminal commands:

sudo apt update && sudo apt full-upgrade

Is there a reason to install server specifically?
Personally I don't see any point in installing Ubuntu server and then use it with a 4K TV but you might have some reason?

Ubuntu release/version?
How are you trying to pair?

Remove the repos, download and install the .deb file according to the instructions for Ubuntu, not Debian.
That will install and add the correct repo.

You can't go wrong with Intel NICs.

System Settings > Privacy
Make sure to adjust everything to your liking.
Besides noting how ridiculous, paranoid and untrue this is, that should be all.

Bitlocker is Microsoft proprietary encryption mechanism. It isn't supported by default in any major Linux distro including Ubuntu.

This method may work but I haven't tested it:...

Skype may have settings for that. It should be the first place to look. I don't use it so I don't know.
If it has no such setting then you can open Startup apps and remove it there.

PS - It...