hudson.plugins.git.GitException: Could not apply tag hudson-Selenium_RC_Plugin-23 at hudson.plugins.git.GitAPI.tag(GitAPI.java:265)
It turns out Git needs a username to be set and the hudson user that the Debian package creates when Hudson is installed doesn’t have one. Easily fixed by using
sudo nano /etc/passwd to add
Hudson,,, into the hudson user’s entry (if you look at your own entry you should see where it needs to go).