For all those who had problems compiling the Sezen Applet from source, we have set up the package in a PPA which will from now on hold git / non-released packages for different applications (for now it just holds the Sezen Applet and the required dependencies).
Install the Sezen Applet in Ubuntu Lucid:
1. Firstly go to System > Administration > Software Sources, and on the "Updates" tab, make sure the "Recommended updates (lucid-updates)" box is checked - this is required for the latest libgtk2.0 package.
2. Add the Git / Unreleased WebUpd8 PPA:
sudo add-apt-repository ppa:webupd8team/unstable && sudo apt-get update sudo apt-get dist-upgrade sudo apt-get install libzeitgeist-1.0-0 zeitgeist #just in case
It will probably work with "upgrade" instead of "dist-upgrade" too, but use "dist-upgrade" just to make sure.
3. Restart the GNOME Panel and add Sezen:
sudo killall gnome-panel
Then right click the panel, select "Add to panel" and search for "Sezen", then add it. That's it!
Remove the PPA and all the packages it installed and install back the packages from the official Ubuntu repositories
Since we found out about PPA Purge, reverting every change a PPA makes on your system is a few commands away.
If you want to revert all the changes made by this PPA, simply run the following commands in a terminal:
wget https://launchpad.net/~nilarimogard/+archive/webupd8/+files/ppa-purge_0.2.6~webupd8~lucid_all.deb sudo dpkg -i ppa-purge_0.2.6~webupd8~lucid_all.deb sudo ppa-purge ppa:webupd8team/unstable
You can also install the stand-alone Sezen application from a PPA.
See also: Chrome and Firefox Extensions For Sezen (Zeitgeist)