I just upgraded from 15.10 to 16.04. I had eclipse installed with the pydev environment. After the upgrade eclipse seemed to hang during first start. So after some time I killed the process. Second start went well but the pydev menu entires disappeared (new pydev project, preferences-pydev, etc). I removed pydev in eclipse, then re-installed eclipse from software-center and finally installed pydev again via eclipse "install new software". Eclipse shows pydev as installed but it is still not visible/usable.
Can anybody give me advice? My installed versions are: Ubuntu 16.04 LTS (amd64), Eclipse 3.8.1, PyDev for Eclipse 188.8.131.52605051159