Thanks for the speedy reply
I have worked out how to open a terminal, and copied your code across. It has flung some code at me and I don't have a clue what it means:-
sudo apt-get install gimp gimp-plugin-registry gimp-gmic gimp-data-extras
[sudo] password for oxlade:
Reading package lists... Done
Building dependency tree
Reading state information... Done
gimp is already the newest version.
The following extra packages will be installed:
libgfortran3 libgtkglext1 liblapack3 liblqr-1-0 libtiff-tools
gmic icc-profiles libtiff-opengl
The following NEW packages will be installed
gimp-data-extras gimp-gmic gimp-plugin-registry libgfortran3 libgtkglext1
liblapack3 liblqr-1-0 libtiff-tools
0 upgraded, 8 newly installed, 0 to remove and 12 not upgraded.
Need to get 13.2 MB of archives.
After this operation, 29.8 MB of additional disk space will be used.
Do you want to continue [Y/n]?
Is opening a terminal like opening C: in windows and working
in DOS? I have just found Gimp 2.8 hiding in a long list so will check it out.... I assume I select N on the terminal?