You don't want to read another “Ooh, I've upgraded by Ubuntu” story, do you? As Effusion's dissenter Jonathan Hunt said,
Ha, here comes the monoculture! ;-)
So, I have a working Ubuntu 7.04, and a Gutsy Gibbon 7.10 alternate ISO file on a USB key … but no CD. Normally, popping an update CD in will trigger the Upgrade Manager, but not with an ISO.
But all is not lost. On the top of the ISO filesystem is a handy script, cdromupgrade. All we have to do is mount the ISO on a loopback filesystem and run the script (with an absolute filename, apparently).
# ls /media/USBKEY ubuntu-7.10-alternate-i386.iso # mkdir /tmp/u710 # mount -t iso9660 -o loop /media/USBKEY/ubuntu-7.10-alternate-i386.iso /tmp/u710 # /tmp/u710/cdromupgrade
Up pops the Upgrade Manager, ready to rock and roll!
Now, will it work … ?