Comment 4 for bug 1219998

Potential workaround:

Open a terminal and issue the command

gksudo gksudo gedit /var/lib/dpkg/info/fglrx-pxpress.postinst

This will most probably ask for the password and then open an editor with the post installation script loaded.

Scroll down to the end of the file and then about ten lines back up until you find a line that reads

           has_aticonfig="$(which aticonfig)"

modify that line into

           has_aticonfig="$(which aticonfig || true)"

save the file and close the editor

finally execute the terminal command

sudo dpkg --configure -a