Comment 13 for bug 1890803

From the log:

Begin: Running /scripts/init-bottom ... Warning: overlayroot: configuring overlayroot with driver=overlay mode=tmpfs opts='' per /root.tmp/etc/overlayroot.local.conf
Failure: overlayroot: failed to modify /etc/fstab (step 2)
Success: overlayroot: configured root with 'tmpfs' using overlay per /root.tmp/etc/overlayroot.local.conf
done.

It appears that it's the same issue all around (the tmpfs overlay is not getting setup correctly) so the rootfs is not writable after the overlay.

But if it's reproducible on x86 then we can test this out in curtin vmtest. If we see the same failure then we can examine the initramfs logic and see why we're not getting proper overlayfs setup.