Comment 4 for bug 1878541

Starting uc20 in a virsh domain, whilst controlling for peak memory usage, and modifying command line to boot to "rdinit=/bin/sh" => meaning boot to unpacked initrd and start busybox shell without doing anything else.

The rss memory achieved to get to that point was 744684, out of 2033104 available (i'm not sure which units virsh is using here, but it is ~740MB out of 2048MB).

Note on any other platform or mode, we do not loop mount xz compressed snap. And we have stopped using lzma/xz for kernel image or modules compression throughout Ubuntu.

Next steps is to try booting with kernel.snap without compression, or unpacked.