After downloading an
.iso file from ubuntu.com (please tick the box under the “Start Download” green button if you want the alternate version and choose a mirror close to your location), you need to verify that the
.iso file is not corrupted before you can use it to install Ubuntu.
- md5sum on the downloaded file
Go to the directory the file is located and run
md5sum. In the example below, I had downloaded the file to the desktop:
:~ $cd Desktop/ :~/Desktop $ md5sum ubuntu-7.10-alternate-i386.iso 9a4ae3cfd68911a861d094ec834c9b48 ubuntu-7.10-alternate-i386.iso
Then verify it matches the hash from the Ubuntu release.
- md5sum on the burnt file
Once you have burnt the
.isofile to a CD, it is a good idea to check it too, and verify nothing happened during the process. By default, Ubuntu mounts the cdrom to /media:
:~ $ cd /media/cdrom0/ :/media/cdrom0 $ md5sum -c md5sum.txt | grep -v 'OK$' :/media/cdrom0 $
If the match is good, there will be no error on the output.
You can then use the disk to install Ubuntu :)
Shamelessly inspired from the Ubuntu Community Documentation page. Please refer to this page if you are downloading and burning the
.iso file on Windows.