New & frustrated with nvme0n1p7 and manually fsdk

[mahesh]

Hi!

First of all, I'm sorry if this is something very basic and I'm stuck in nonsense.
After an amazing week with Ubuntu in my laptop (with a dual boot with windows 11) yesterday I got into windows for a moment and when I went back to Ubuntu it gave me the following error:

UNEXPECTED INCONSISTENCY: RUN fsck
MANUALLY
fsck exited with status code 4
The root filesystem on /dev/nvme0n1p7

I read a bunch of post and videos about this and finally - after try a lot of options - I runned fsck /dev/nvme0n1p7 and start an never ending process pressing y.
I also tried to run Ubuntu from the installation USB with sudo and same option but with same result.

I have no problem to re-made the installation from 0. But I really want to understand what's happening to learn something and - over all - to not repeat it in the future

Thank you very much in advance!