This bug was fixed in the package shadow - 1:4.1.5.1-1ubuntu9.1
---------------
shadow (1:4.1.5.1-1ubuntu9.1) trusty; urgency=medium
[ William Grant ]
* debian/patches/1020_fix_user_busy_errors:
- libmisc/user_busy.c: Call sub_uid_close in all error cases, otherwise
code that later opens it as RW fails obscurely. (LP: #1342875)
-- Steve Langasek <steve.langa...@ubuntu.com> Fri, 10 Jul 2015
13:06:20 -0700
** Changed in: shadow (Ubuntu Trusty)
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/1342875
Title:
Unable to delete currently logged in user
Status in shadow package in Ubuntu:
Fix Released
Status in shadow source package in Trusty:
Fix Released
Status in shadow source package in Utopic:
Won't Fix
Bug description:
[SRU justification]
Regression from previous releases, this prevents cloud instance setup
processes from removing the default admin account that's exists solely for the
purpose of the setup itself.
[Test case]
1. Create a trusty schroot environment
2. Log into the trusty schroot environment as a non-root admin user: schroot
-c trusty
3. Attempt to remove the admin account: sudo userdel -f vorlon (warning! do
not use -r if your host system's home directory is mounted!)
4. Observe the following error:
userdel: user vorlon is currently used by process 5253
userdel: cannot open /etc/subuid
5. Upgrade to the passwd package from trusty-proposed
6. Attempt to remove the admin account again
7. Verify that the command has succeeded.
[Regression potential]
Minimal, as this is a targeted bugfix to the error handling for subuids.
A user can not delete themselves using the command 'sudo userdel -rf
<username>', this is common in cloud tools that clean up running images prior
to capture. A quick test shows that this worked from Precise (didn't look back
further) to Raring and stopped working with Saucy.
Here's a quick example of the failure (from trusty):
# sudo adduser test
# sudo usermod -aG sudo test
## As the 'test' user
# sudo userdel -rf test
userdel: user test is currently used by process 9600
userdel: cannot open /etc/subuid
## User is not removed
Previously (output from precise)
# sudo userdel -rf test
userdel: user test is currently logged in
userdel: warning: can't remove /var/mail/test: No such file or directory
## User is removed
This is being run as the last command by tools that remove the
'ubuntu' user to clean the image prior to capture. This had
previously worked and it is preferable that this could be made to work
again. The alternative is removal by root, but the root user on cloud
images is locked down and we would not want the user to enable root to
run userdel on the risk of it not getting disabled properly prior to
image capture.
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