i have been getting these error messages for a while now, and they don't seem to cause any problems.
debconf: unable to initialize frontend: Gnome
debconf: (Unable to load Gnome -- is libgnome-perl installed?)
debconf: falling back to frontend: Dialog
I get that error message just after i have downloaded a package with apt-get and it is getting ready to install it.
i assume it's just because i dont have the above apps. installed, and it dosen't cause any harm, right?