I have solved the problem on my way.
The problem was:
I installed Edubuntu on small "/" partition and I realised it should be bigger.
I tried to make my Edubuntu partitions bigger with
parted but with no desired result.
My solution:I realised that is best to reinstall Edubuntu. Now I have fixed MBR with a little program MbrFix.exe and successfully reinstalled Edubuntu
MbrFix.exe is possible to download on
http://www.sysint.no/en/Download.aspx
My new question for you:
Is there any good documentation (or Howto) on
parted?
Thanks for your help