Messages in the error logs. Looks like the problem is due to Python. Probably we're either missing a python library on the new server, or it's a version compatibility issue (the old server had Python 2.6 and the new server has Python 2.7).

[2015-05-18 07:09:27,284] INFO  com.google.gerrit.common.ChangeHookRunner : hook[patchset-created] exitValue:1
[2015-05-18 07:09:27,284] INFO  com.google.gerrit.common.ChangeHookRunner : hook[patchset-created] output: Traceback (most recent call last):
[2015-05-18 07:09:27,285] INFO  com.google.gerrit.common.ChangeHookRunner : hook[patchset-created] output:   File "/home/gerrit/mahara-scripts/patchset-created", line 122, in <module>
[2015-05-18 07:09:27,285] INFO  com.google.gerrit.common.ChangeHookRunner : hook[patchset-created] output:     sys.exit(main())
[2015-05-18 07:09:27,285] INFO  com.google.gerrit.common.ChangeHookRunner : hook[patchset-created] output:   File "/home/gerrit/mahara-scripts/patchset-created", line 78, in main
[2015-05-18 07:09:27,285] INFO  com.google.gerrit.common.ChangeHookRunner : hook[patchset-created] output:     args, unused = getopt(sys.argv[1:], '', gerrit_args)
[2015-05-18 07:09:27,285] INFO  com.google.gerrit.common.ChangeHookRunner : hook[patchset-created] output:   File "/usr/lib/python2.7/getopt.py", line 88, in getopt
[2015-05-18 07:09:27,285] INFO  com.google.gerrit.common.ChangeHookRunner : hook[patchset-created] output:     opts, args = do_longs(opts, args[0][2:], longopts, args[1:])
[2015-05-18 07:09:27,285] INFO  com.google.gerrit.common.ChangeHookRunner : hook[patchset-created] output:   File "/usr/lib/python2.7/getopt.py", line 152, in do_longs
[2015-05-18 07:09:27,285] INFO  com.google.gerrit.common.ChangeHookRunner : hook[patchset-created] output:     has_arg, opt = long_has_args(opt, longopts)
[2015-05-18 07:09:27,285] INFO  com.google.gerrit.common.ChangeHookRunner : hook[patchset-created] output:   File "/usr/lib/python2.7/getopt.py", line 169, in long_has_args
[2015-05-18 07:09:27,285] INFO  com.google.gerrit.common.ChangeHookRunner : hook[patchset-created] output:     raise GetoptError('option --%s not recognized' % opt, opt)
[2015-05-18 07:09:27,285] INFO  com.google.gerrit.common.ChangeHookRunner : hook[patchset-created] output: getopt.GetoptError: option --kind not recognized


[2015-05-18 09:05:10,905] INFO  com.google.gerrit.common.ChangeHookRunner : hook[change-merged] exitValue:1
[2015-05-18 09:05:10,905] INFO  com.google.gerrit.common.ChangeHookRunner : hook[change-merged] output: Traceback (most recent call last):
[2015-05-18 09:05:10,906] INFO  com.google.gerrit.common.ChangeHookRunner : hook[change-merged] output:   File "/home/gerrit/mahara-scripts/change-merged", line 187, in <module>
[2015-05-18 09:05:10,906] INFO  com.google.gerrit.common.ChangeHookRunner : hook[change-merged] output:     sys.exit(main())
[2015-05-18 09:05:10,906] INFO  com.google.gerrit.common.ChangeHookRunner : hook[change-merged] output:   File "/home/gerrit/mahara-scripts/change-merged", line 163, in main
[2015-05-18 09:05:10,906] INFO  com.google.gerrit.common.ChangeHookRunner : hook[change-merged] output:     args, unused = getopt(sys.argv[1:], '', gerrit_args)
[2015-05-18 09:05:10,906] INFO  com.google.gerrit.common.ChangeHookRunner : hook[change-merged] output:   File "/usr/lib/python2.7/getopt.py", line 88, in getopt
[2015-05-18 09:05:10,906] INFO  com.google.gerrit.common.ChangeHookRunner : hook[change-merged] output:     opts, args = do_longs(opts, args[0][2:], longopts, args[1:])
[2015-05-18 09:05:10,906] INFO  com.google.gerrit.common.ChangeHookRunner : hook[change-merged] output:   File "/usr/lib/python2.7/getopt.py", line 152, in do_longs
[2015-05-18 09:05:10,906] INFO  com.google.gerrit.common.ChangeHookRunner : hook[change-merged] output:     has_arg, opt = long_has_args(opt, longopts)
[2015-05-18 09:05:10,906] INFO  com.google.gerrit.common.ChangeHookRunner : hook[change-merged] output:   File "/usr/lib/python2.7/getopt.py", line 169, in long_has_args
[2015-05-18 09:05:10,906] INFO  com.google.gerrit.common.ChangeHookRunner : hook[change-merged] output:     raise GetoptError('option --%s not recognized' % opt, opt)
[2015-05-18 09:05:10,906] INFO  com.google.gerrit.common.ChangeHookRunner : hook[change-merged] output: getopt.GetoptError: option --change-owner not recognized