For those on lubuntu 13.04, the issue is still present and the missing dependencies break the IBus installation altogether. I had to use g00gle's suggestion in conjunction with reinstalling ibus:
$ sudo apt-get install libappindicator1 python-appindicator python-gconf python-glade2 python-pexpect $ sudo apt-get install --reinstall ibus
I logged out and in and everything was as expected.
For those on lubuntu 13.04, the issue is still present and the missing dependencies break the IBus installation altogether. I had to use g00gle's suggestion in conjunction with reinstalling ibus:
$ sudo apt-get install libappindicator1 python-appindicator python-gconf python-glade2 python-pexpect
$ sudo apt-get install --reinstall ibus
I logged out and in and everything was as expected.