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Lubuntu 18.04, because it's a flavor of Ubuntu, has only 3 years of support and it just ended.
You need to upgrade to 20.04 which is actually a good thing because what you need to work you already...

A very "duh" moment, indeed.
Don't worry, we all have had those.

Probably because

Meaning: Installed Grub for BIOS by reading an old guide and copy/pasting commands. Effectively turning it into a legacy installation. Unsurprisingly and Windows is unbootable. ...

Much faster, fool-proof, installs all the correct packages and schedule trim jobs correctly for NVME, etc. etc.

Welcome.

The instructions you followed imply an active (albeit alternative and temporary, if applicable) internet connection.

Welcome.


You couldn't have, not directly anyway.
Dido you upgraded like 19.04 -> 19.10 -> 20.04? Some other method? Or was it actually a fresh installation?
If you did install 20.04 from...

FYI, Your Genius headset is as much "chinese" as all the others. Literally all the others, from total rubbish to the best money can buy, all are made in China and now more often than not, also...

Love it and use it frequently but it's NOT a video editor.

Apr 20 21:38:27 pc smartd[881]: Device: /dev/sda [SAT], 6 Currently unreadable (pending) sectors
Apr 20 21:38:27 pc smartd[881]: Device: /dev/sda [SAT], 1 Offline uncorrectable sectors
Apr 20...

Please note it does need Samba and it'll be be installed on demand if not installed already.

And I don't know about you and the others but I'm still not convinced this has anything to do with...

Reinstallaling is by far the best option.

Welcome.

Such devices are out of support for decades.
Ubuntu still has this Dialup Modem How To but probably nothing there will work now.

Welcome.

Does it prevent booting? If not you can ignore it.

Welcome.

This is the sticky thread you should have read: https://ubuntuforums.org/showthread.php?t=370108


That being the case you should also post what you did.

Also asked here https://askubuntu.com/questions/1332537/accidently-lost-home-during-shrinking-process-with-resize2fs

When release upgrades fail the best solution is a fresh install.

+1
+1
+1

I guess it makes +3? :lolflag:

No, you couldn't have created an EXT4 partition from Windows.
And no partition is needed, unallocated space is and unallocated space isn't a partition. The installer should detect the unallocated...

With LVM+LUKS the installer typically creates a separated /boot partition and the default size used to be very small indeed.
Normal installations do not have that problem.

Also asked here https://askubuntu.com/questions/1332432/hdmi-not-working-fx706iu

Please do as suggested.

I think you mean a smallish /boot partition. The ESP stores .efi files, not kernels.

3 weeks doesn't seem that long.

You're right, but my comment was regarding the Nvidia driver. Those get dropped, you know.

340 is LTS (Nvidia's) and still available but for how long?
One of the previous LTS branches, 304,...

You had no problem to solve to start with. It was all in your head.

If you have any "secure boot" mention in your firmware then it's UEFI but in your case "wrongly" (as in not recommended because...

This should be temporary only. You need to install Nvidia drivers then remove nomodeset.