For those having problems (Like I did!) installing Lazarus in Ubuntu 16.04
http://installion.co.uk/ubuntu/xenial/universe/l/lazarus/install/index.html
I then had a problem with a libmysqlclient error
so, installed this one
http://launchpadlibrarian.net/212189159/libmysqlclient18_5.6.25-0ubuntu1_amd64.deb
which I found on
https://launchpad.net/ubuntu/xenial/amd64/libmysqlclient18/5.6.25-0ubuntu1
was having loads of problems, so fresh install of ubuntu, then did all above - works perfectly.
On the way, I made snapshots of my Ubuntu install using
http://tipsonubuntu.com/2016/07/30/create-system-restore-points-ubuntu-16-04/
HTH