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Here's the relevant part of the curtin output:
Installing for i386-pc platform.
Installation finished. No error reported.
umount: /tmp/tmpM4R1dI/target/dev: device is busy.
(In some cases useful info about processes that use
the device is found by lsof(8) or fuser(1))
Unexpected error while running command.
Command: ['umount', '/tmp/tmpM4R1dI/target/dev']
Exit code: 1
Reason: -
Stdout: ''
Stderr: ''
Installation failed with exception: Unexpected error while running command.
Command: ['curtin', 'curthooks']
I spoke with Scott Moser on IRC about this, and he suggested the
attached patch, which fixed the problem 100%.
I checked the installation output of a few of my MAAS nodes, and didn't
see any lsof output. So I assume the "udevadm settle" command is the
fix.
(Thanks Scott! I hope we can land this in time for MAAS 1.8.)
** Affects: curtin
Importance: Undecided
Status: Fix Committed
** Affects: curtin (Ubuntu)
Importance: Medium
Status: Confirmed
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curtain fails with "Device is busy" error during unmount
https://bugs.launchpad.net/bugs/1462139
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