I think I have found a way but it is more of a hack. When I remove:
rootflags=subvol=${rootsubvol}
from the line GRUB_CMDLINE_LINUX="rootflags=subvol=${rootsubvol}
${GRUB_CMDLINE_LINUX}" in the file /etc/grub.d/10_linux I can boot from the rw
snapshot snapper makes when I issue the command:
sudo snapper rollback 38
You will have to do an update-grub before the snapper rollback command to write
the new cfg file.
This method will most likely fail if an update replaces the 10_linux file and I
don't know how safe it is considering it is not officially supported.
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https://bugs.launchpad.net/bugs/1734496
Title:
snapper rollback does not work on ubuntu for btrfs
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