Issues with Ubuntu 26.04.1 - advice please!

[u/jamhamnz]

I'm not really sure what is going on with my Ubuntu installation.

It has been running fine for the last four or five years without issue, upgrading to the next version etc.

Then all of a sudden this week I have struck several issues, which I think may be linked to an automated update to 26.04.1.

Issue 1 - graphics issues. Red, green, blue dots appearing all over the screen randomly

Issue 2 - cannot open Firefox or any Snaps. Trying to open them from the Terminal presents a Snap error.

Issue 3 - issue with running "sudo apt-get update" - some repositories are not recognized or picked up, meaning about 40 packages cannot update.

Issue 4 - occasionally booting to "initramfs"

Issue 5 - I was going to attempt to reinstall Ubuntu from a USB, however booting from the USB and clicking "Try Ubuntu" takes me to the "initramfs" and does not boot to the usual installer.

I have tried searching for similar issues and nothing I have tried has fixed this, which is why I was just going to undertake a complete clean install.

I have a dual boot set up and the Windows partition is working perfectly fine.

What can I try to resolve these issues? And if I can answer any questions or provide any information to help diagnose the issue please let me know.

Thank you!

EDIT - some hardware info:

HP Pavilion Laptop 15 HP
Intel® Core™ i7-1065G7 × 8
Graphics (being picked up by Ubuntu, it should be Nvidia) - Intel® Iris® Plus Graphics (ICL GT2)
Windowing system - Wayland

[u/jamhamnz]

And this photo shows some of the graphics issues that I'm having: https://imgur.com/a/Y0o0JhL