I have recently updated my laptop from Ubuntu 19.10 to Ubuntu 20.04. During the update process I had some errors that were referring to the kernel. Anyway, once the update was done and I tried to reboot the laptop it got stuck at the boot screen saying:
not syncing VFS: Unable to mount root fs on unknown
So the I rebooted the system, this time selecting the previous kernel (5.3) and Ubuntu 20.04 booted fine. Anyway, when I tried to install the initrams for that kernel I was unable to. It seems that the problem is related to kernelstub. The following is from the log of
sudo apt reinstall -f linux-image-5.4.0-26-generic
update-initramfs: Generating /boot/initrd.img-5.4.0-26-generic apt
reinstall -f linux-image-5.4.0-26-generic
/etc/initramfs/post-update.d//zz-kernelstub: line 7: kernelstub:
command not found run-parts:
/etc/initramfs/post-update.d//zz-kernelstub exited with return code
127 run-parts: /etc/kernel/postinst.d/initramfs-tools exited with
return code 1 dpkg: error processing package
linux-image-5.4.0-26-generic (--configure): installed
linux-image-5.4.0-26-generic package post-installation script
subprocess returned error exit status 1 Errors were encountered while
processing: initramfs-tools linux-image-5.4.0-26-generic E:
Sub-process /usr/bin/dpkg returned an error code (1)
