Not a question, rather to save other some headache that runs into this. I noticed snapd was failing after upgrading some packages:
systemctl --failed
To fix this you will need to rebuild the kernel with:
CONFIG_SQUASHFS
CONFIG_SQUASHFS_XZ
options enabled, make sure CONFIG_SQUASHFS gets a checkmark (not a dot). Use the find/search feature to find it.
Cheers!