The problem here is that the runit package assumes that the system is using upstart; it does not work with systemd, which became the default as of 15.04. Another package besides git-all which is affected by this is qmail-run.
Hopefully by the time 15.10 appears the packages which implicitly depend on having upstart running will have been adjusted to work with systemd, and you can switch back to systemd by installing systemd-sysv and ubuntu-standard.
The problem here is that the runit package assumes that the system is using upstart; it does not work with systemd, which became the default as of 15.04. Another package besides git-all which is affected by this is qmail-run.
A workaround is to switch your 15.04 system back to using upstart. This can be done by installing the upstart-sysv package. See https:/ /wiki.ubuntu. com/SystemdForU pstartUsers .
Hopefully by the time 15.10 appears the packages which implicitly depend on having upstart running will have been adjusted to work with systemd, and you can switch back to systemd by installing systemd-sysv and ubuntu-standard.