Creating an instance from a backup fails on Ubuntu 14.04: there is an unhandled error from pexpect.close(force=True). The restore strategy needs to handle the pexpect error and continue on to 'sudo kill' the remaining processes as it does today.
The root cause appears to be a change in kill behavior when killing sudo processes between Ubuntu 12.04 and 14.04 such that the same pexpect call raises an error only on 14.04. The underlying change can be reproduced without python -- in the following examples note that kill succeeds on 12.04 and not 14.04:
* Ubuntu 12.04.4 LTS
$ sudo tail -f /var/log/syslog &
[1] 13407
$ ps -ef | grep tail
root 13407 1863 0 15:14 pts/0 00:00:00 sudo tail -f /var/log/syslog
root 13408 13407 0 15:14 pts/0 00:00:00 tail -f /var/log/syslog
$ kill -9 13407
[1]+ Killed sudo tail -f /var/log/syslog
$ ps -ef | grep tail
root 13408 1 0 15:14 pts/0 00:00:00 tail -f /var/log/syslog
* Ubuntu 14.04 LTS
$ sudo tail -f /var/log/syslog &
[1] 5915
$ ps -ef | grep tail
root 5915 5202 0 15:14 pts/0 00:00:00 sudo tail -f /var/log/syslog
root 5916 5915 0 15:14 pts/0 00:00:00 tail -f /var/log/syslog
$ kill -9 5915
-bash: kill: (5915) - Operation not permitted
$ ps -ef | grep tail
root 5915 5202 0 15:14 pts/0 00:00:00 sudo tail -f /var/log/syslog
root 5916 5915 0 15:14 pts/0 00:00:00 tail -f /var/log/syslog
The pexpect exception:
File "/usr/local/
raise ExceptionPexpec