@Landslyde:
Have you tried Online Package Manager? It is a great tool to help you instal packages:
Lazarus main menu > Package > Online Package Manager
If your Lazarus has become messy, you need to complete uninstall them:
01. Uninstall lazarus, fpc, fpc-src
02. Delete ~/.lazarus
03. Delete /etc/fppkg (folder)
04. Delete /etc/fp.*
05. Delete /usr/share/fpcsrc (folder)
06. Delete /usr/lib/fpc (folder)
07. Delete /usr/bin/ppc*
and then reinstall the FPC, FPC-Source and Lazarus