How to check if an Ubuntu cd has been burned correctly.
First thing I do is download an iso. And open it with k3b. This program wil calculate an md5sum of the iso. I will check this with the checksum on the ubuntu hashes site : https://help.ubuntu.com/community/UbuntuHashes.
Instead of checkin with k3b. This can be done from the commandline: md5sum Ubuntu.iso.
(hey and burning can be done with wodim from the commandline)
(hey2 that’s what k3b is using too)
If the calculated hash matches the one on this site, I’ll burn the cd.
After burning. I’ll check the burned medium with md5sum /dev/cdrom. If this hash is also correct, the install can begin.