Comment 12 for bug 2008951

I can categorically say that this issue is now behind me. The issue turned out to be kernel driver support for the "Realtek RTL8111/8168/8411 ethernet controller" on the Lenovo Legion 5 gaming laptop.

After much web searching I came across this post from reddit:
https://www.reddit.com/r/Fedora/comments/gejn0v/r8169_ethernet_flapping_connection_loss/

This started a search for "install r8168 driver and blacklist r8169" which led me to:
https://packages.debian.org/sid/r8168-dkms

Following the advice to use the installed distribution manager to add the r8168 driver I then ran:

===> sudo apt install r8168-dkms

Rebooting the machine after this and have not had a sudden shutdown since.

This issue made me think that "gimp" tool was first at fault as I started having the issue when using it.
Then "firefox", then "gnome" started acting up! All this time many packages got corrupted from incomplete updates, etc. I finally re-installed Ubuntu from iso at the 22.04.02 level and then came onto the stated solution above. Hope that this can help someone else who may be starting to regret purchase of this fine machine.

I dual boot Windows 11 and Ubuntu Linux, each on it's own NVMe drive.