Ubuntu 11, 12 and 14 doesn't contain recent version of Lazarus in repository. Here are some instruction to install it.
Remove existing installation:
sudo apt-get purge fpc lazarus sudo rm -Rf /usr/lib/fpc sudo rm -Rf /usr/lib/lazarus sudo rm -Rf /usr/share/fpcsrc
It is not necessary, but you can clear old settings too:
sudo rm -Rf ~/.fpc sudo rm -Rf ~/.lazarus
Now download deb packages corresponding to your environment from Lazarus's sourceforge site. Three packages are required:
where "nnn" et "xxx" are the the versions and "mmm" is the target platform i.e. amd64.
Install development version of libgtk2:
sudo apt-get install libgtk2.0-dev
Go to download directory and start installation:
sudo dpkg -i *.deb
You are ready to launch Lazarus now.
If you want to see main menu in the same window you should do it from terminal or create a small shell script:
#/bin/sh export UBUNTU_MENUPROXY= startlazarus
How to create a shortcut to start your script from desktop in Ubuntu 12+ (Unity)?
sudo apt-get install --no-install-recommends gnome-panel gnome-desktop-item-edit ~/Desktop/ --create-new