The alternate Ubuntu 8.04 CD

I’m writing from the PC, not the laptop.
This one – the PC – runs Debian and it’s quite steady. But I don’t use it very often.

I like the laptop which is in upgrade of the Ubuntu, from 7.10 to 8.04.

I tried to do all “regular” upgrade instructions for the laptop, including this (Network upgrade):

meorero@myubuntu:~$ sudo  do-release-upgrade
Checking for a new ubuntu release
 0% [Working
...

But it ends with the following error:

Could not calculate the upgrade

A unresolvable problem occurred while calculating the upgrade.

This can be caused by:
* Upgrading to a pre-release version of Ubuntu
* Running the current pre-release version of Ubuntu
* Unofficial software packages not provided by Ubuntu

If none of this applies, then please report this bug against the
'update-manager' package and include the files in
/var/log/dist-upgrade/ in the bugreport.


Restoring original system state

Aborting
cdrom://Ubuntu 7.10 _Gutsy Gibbon_ - Release i386 (20071016.1) gutsy/main Packag
cdrom://Ubuntu 7.10 _Gutsy Gibbon_ - Release i386 (20071016.1) gutsy/main Packag
cdrom://Ubuntu 7.10 _Gutsy Gibbon_ - Release i386 (20071016.1) gutsy/main Packag
cdrom://Ubuntu 7.10 _Gutsy Gibbon_ - Release i386 (20071016.1) gutsy/main Packag
cdrom://Ubuntu 7.10 _Gutsy Gibbon_ - Release i386 (20071016.1) gutsy/main Packag
cdrom://Ubuntu 7.10 _Gutsy Gibbon_ - Release i386 (20071016.1) gutsy/restricted
Reading package lists: Donetable/non-free Packages: 90
Reading state information: Done
Reading state information: Done
Reading state information: Done
meorero@myubuntu:~$

So… Now I’m downloading the ubuntu-8.04-alternate-i386.iso CD from the mirror of isoc.org.il.