I've bought a new laptop (dell inspiron 15 3521) with windows 8. Since I mainly use linux I removed the 7 partitions windows 8 apparently needed and made 4 partitions using a pmagic live usb (windows 80 gb, linux 80 gb, data 150 gb, swap 8 gb) and since I had some problems with getting it to boot from a dvd I installed linux first without problems.
But when I got the dvd to work (legacy mode and the a driver on a usb plugged in during installation Serial-ATA_Driver_85FV7_WN_18.104.22.1683_A01) it gave an error (windows cannot be installed on this disk. The selected disk is of the GPT partition style.).
To fix this I removed all partitions (including the ubuntu partition) and made a new one. windows also made a dedicated windows partition of 100mb.
After the timely installation of windows 7 I got out my ubuntu 13.04 usb drive and preformed a live boot. When I got to the point of creating a new partition (using the ubuntu 13.04 installer) for linux the partition manager didn't show any partitions on the drive at all only 320 gb of 'unallocated space'. I was however able to mount the partitions on the drive. So I know they are there and that ubuntu can see them.
So I booted with my pmagic live usb and the partition editor promted me with the following question:
Warning: /dev/sda contains GPT signatures, indicating that it has a GPT table. However, it does not have a valid fake msdos partition table, as it should. Perhaps it was corrupted -- possibly by a program that doesn't understand GPT partition tables. Or perhaps you deleted the GPT table, and are now using an msdos partition table. Is this a GPT partition table? Yes/No?
Who can help me to fix this problem?