Upgrading to 16.04

[Ralf Mardorf]

On Sat, 20 Aug 2016 10:59:40 +1000, Peter wrote:
>It complained that a package libqt5x11extras5 is  not installed.

Your line off commands should have ended with "&& sudo apt-get -f
install" and this does fix issues regarding missing dependencies after
installing with "dpkg -i --force-depends". Let alone that one of the
links I provided, explained how to install gdebi, "sudo apt-get install
gdebi".