I had a functioning ubuntu 14.04 system that I upgraded to 16.04 and everthing seemed to be working fine until I somehow changed my partition ( I think) from mbr to gtp.
My computer won't boot even to the grub menu so since my /home is on a seperate partition I decided to reinstall ubuntu 14.04 without reformatting /home to get system back (as I've done before) The problem is that after selecting something else and formatting / as ext4 and setting /home as ext4 but not formatting it, I hit install now and got the following error which I've never seen before.
" The partition table format in use on your disks normally requires you to create a separate partition for boot loader code. This partition should be marked for use as “Reserved BIOS boot area” and should be at least 1 MB in size. Note that this is not the same as a partition mounted on /boot. If you do not go back to the partitioning menu and correct this error, bootloader installation may fail later, although it may still be possible to install the boot loader to a partition."
Also there is small amounts of "free space" showing up between partitions in the install partition table.
Is there anything I can do to get back to a working ubuntu install, for instance if I shut down and boot to live CD again (to change from UEFI to BIOS somehow) have I wrecked everything by already formatting SDA5?
Edit /etc/fstab looks like
overlay / overlay rw 0 0
tmpfs /tmp tmpfs nosuid,nodev 0 0
/dev/sda6 swap swap defaults 0 0
Also. Output of gdisk /dev/sda is
GPT fdisk (gdisk) version 0.8.8
Partition table scan:
BSD: not present
APM: not present
Found valid GPT with protective MBR; using GPT.
Could I get back to mbr using gdisk? I could if MBR was present but I'm not sure with protective.