I have installed Qgis on ubuntu. it works fine but I am not getting option to add new plugins only option to manage plugins is available. Please help
Did some digging around on the QGIS site. Apparently you need to install the python-gis package if you want to use the python plugins.
sudo apt-get install python-qgis
You should now be able to add new plugins :)
If I'm not mistaken, you need to enable the Plugins Installer. Just activate it in Plugins Manager.
I had the same problem on Ubuntu 11.10 (oneiric). To get the python plugin installer back, I uninstalled all qgis packages, added the unstable ubuntu-gis repositories (https://launchpad.net/~ubuntugis/+archive/ubuntugis-unstable):
deb http://ppa.launchpad.net/ubuntugis/ubuntugis-unstable/ubuntu oneiric main
deb-src http://ppa.launchpad.net/ubuntugis/ubuntugis-unstable/ubuntu oneiric main
and then reinstalled qgis. Hope this works for you.
This can also happen if you start QGIS from a Python virtual environment shell.
I had a previously perfectly working QGIS+Python system suddenly stop doing Python. Nothing had changed or upgraded. It was literally working ten minutes ago. Then it wasn't.
Turned out I'd started it from a Python virtual environment, so the python libs needed weren't there. Opened a fresh shell, started QGIS, Python working nicely.
I still occasionally start QGIS from a virtual environment and go "oops".