By the way, interesting observation in this content.
The 'p' separator is only used when parted /creates/ partition (thus
adding them through its own call to DM/dm_add_partition() function).
If the partitions already exist and are only formatted, parted won't have to
create them, and the '-part' separator from the kpartx call in
/lib/partman/commit.d/31multipath_partitions kicks in.
Also, existing partitions from other devices (even non-formatted) show up with
'-part' due to that kpartx call and the absence of parted partition creation.
The remaining problem is that subsequent stages which query partitions
names/path from parted will still receive 'p' separator, and fail, as
the those device names don't exist (e.g., the swap formatting error
above).
Maybe a solution is to remove the devices with parted's 'p'-separator
with 'kpartx -d [-p p]', re-add them with 'kpartx -a -p -part', and
create a symlink for a device name with 'p'.
That will make the '-part' device names available for everywhere (lots
of code use them in partman.. also grub-installer, at least). It still
doesn't fix this bug (as the device names for /etc/fstab come from
parted.. so, with 'p'.. but helps in some way.
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https://bugs.launchpad.net/bugs/1424734
Title:
Incorrect multipath device names in /etc/fstab
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