Boot problems

Hello,

I have a dual boot computer. One of the systems is Trisquel9, and that's the one I am having problems with.

I am going to try to tell the whole story, but I might forget some steps in between.

My Trisquel9 installation is encrypted and it has a partition for home.

I was using both apt and guix as package managers.

I once did a linux-libre kernel upgrade.

Lately I started to have problems with both package managers, some errors were stopping me from installing things. I did not investigate but I thought the reason could be related to the fact that I was running out of space in the root partition. The cause could be related to other things, like some dirty workarounds I made to fix some Python stuff, I don't know.

I started to investigate how to resize a disk-encrypted partition and I cannot remember whether I actually did something. I guess so because I think that was when the booting problems started.

Anyway, this is the situation I am in now:

When booting the computer I see the dual-boot GRUB menu, I choose Trisquel9 and it quickly shows me (among other messages):


Error Communicating to TMP chip
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)


So it does not boot.

I boot from a USB-live system, install Timeshift in it and then restore a snapshot I had from 9 days ago.

It makes no difference, it does not boot, I get the same errors and kernel panic.

On the Internet I find this suggestion for a a similar error:

You are missing the initramfs for that kernel. Choose another kernel from the GRUB menu under Advanced options for Ubuntu and run sudo update-initramfs -u -k version to generate the initrd for version (replace version with the kernel version string such as 4.15.0-36-generic) then sudo update-grub

I follow it. I have:


Trisquel GNU/Linux, with Linux-Libre 5.10.29-gnu
Trisquel GNU/Linux, with Linux-Libre 5.10.29-gnu (recovery mode)
Trisquel GNU/Linux, with Linux-Libre 5.10.19-gnu
Trisquel GNU/Linux, with Linux-Libre 5.10.19-gnu (recovery mode)
Trisquel GNU/Linux, with Linux-Libre 4.15.0-140-generic
Trisquel GNU/Linux, with Linux-Libre 4.15.0-140-generic (recovery mode)
Trisquel GNU/Linux, with Linux-Libre 4.15.0-134-generic
Trisquel GNU/Linux, with Linux-Libre 4.15.0-134-generic (recovery mode)


I choose 5.10.19-gnu. I am happily asked to enter my decrypting passphrase, and then my user password. Triquel 9 finally boots. But I get into a new profile, my home is empty. Somehow my encrypted home partition is not automatically mounted. Anyway, I run the suggested sudo update-initramfs -u -k 5-10-19-gnu

I try to reboot. It does not boot, I get back to the beginning, again the same messages, among them:


Error Communicating to TMP chip
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)


Then I think my time to ask for help has arrived, before I make things even worse.

Please help!