This bug was fixed in the package systemd - 222-1ubuntu1
---
systemd (222-1ubuntu1) wily; urgency=medium
* Merge with Debian unstable. Remaining Ubuntu changes:
- Hack to support system-image read-only /etc, and modify files in
/etc/writable/ instead.
- Keep our much
http://anonscm.debian.org/cgit/pkg-
systemd/systemd.git/commit/?id=afb79c4
** Summary changed:
- package udev 219-7ubuntu5 failed to install/upgrade: subprocess installed
post-installation script returned error exit status 1
+ package udev 219-7ubuntu5 failed to install/upgrade: group input
