Hi, Richard Owlett wrote: > I had tried "umount /media/richard/Debian 9.1.0 i386 1", but umount objected > to the spaces in the file name.
Use quotation marks to make the directory path a single "word" umount "/media/richard/Debian 9.1.0 i386 1" (It is somewhat astounding that you can mount /dev/sr1 several times. On ye olde Jessie kernel i have to use "-o loop" for the further mounts.) > > > When I run Synaptic, it complains about a line in sources.list > > > file:/home/richard/Desktop/testdvd stretch main contrib non-free In my /etc/apt/sources.list there is the word "deb" or "deb-src" before the URL. man 5 source.list says: The format for a sources.list entry using the deb and deb-src types is: deb [ options ] uri suite [component1] [component2] [...] This matches the complaint about "Type 'file:...'". So if you don't have it yet in the file, then try prepending "deb" deb file:/home/richard/Desktop/testdvd stretch main contrib non-free Have a nice day :) Thomas