If someone wnats to install Ubuntu on Ideapad s205 here is an easy solution for newbies that do not require to downgrade Grub.
(Ubuntu was installed as the primary system without option for dual boot !)
The only thing you should do is not use predefined partition and instead manually select your own partitions:
1st partition - Efi (50mb)
2nd partition - ext4 for the '/' (rest of hard drive memory)
3rd partition - swap (4-5gb)
Tested this solution yesterday and it works 100 %. However the only problem is the WIFI which still does not work but probably there is a way for this too.
The full How to guide is here:
http://ubuntuforums.org/showthread.php?t=1867367
