cannot boot uc20 model with multiple base snaps

[Ian Johnson]

With a uc20 model.json that has multiple base snaps, i.e. core20 and core18, one is unable to boot. A message like this shows up from the initramfs:

model does not specify all the requested essential snaps [base kernel snapd]

this prevents booting an image to install mode.

[Ian Johnson (anonymouse67)]

PR up @ https://github.com/snapcore/snapd/pull/8890

[Ian Johnson (anonymouse67)]

Note that before this is considered fix released, it must be released to ubuntu-core-initramfs and then to the pc-kernel snap.

Also we did backport the fix to 2.45, which is in the archive now, so a rebuild of ubuntu-core-initramfs and then a rebuild of the pc-kernel snap would pick this up fwiw

[Ian Johnson (anonymouse67)]

This should finally be resolved in version 37 of ubuntu-core-initramfs, which is now in the snappy-dev/image PPA, so as soon as the kernel snap is rebuilt this bug will finally be fixed

[Ian Johnson (anonymouse67)]

This is fixed in the pc-kernel snap revision 612 which is now in beta/edge with kernel 5.4.0-49.53.1.

I assume that other non-pc-kernels (i.e. pi-kernel) will also contain the fix with that same kernel version and up.