So, I really screwed things up... Long story short, I deleted my windows 8.1 efi partition and now cannot boot into windows. Furthermore, I don't even have an efi partition left to create a linux install with (which it seems to need so it can put the linux bootloader somewhere).
All I can use on my laptop is the live ubuntu cd. Furthermore, gparted crashes every time I open it giving a very obscure error "Assertion (last_usable <= disk->dev->length) at ../../../libparted/labels/gpt.c:994 in function _parse_header() failed." I'm not even sure my computer can boot off efi anymore as I switched it to legacy mode in the bios menu and haven't been able to get back to it.
I tried using a windows 10 live cd and repairing installing there, but the installer didn't like any of the current existing partitions. For most of them it said there were GPT formatted, and it can't use that.
Where do I even begin to fix this? Is there some way I can create an efi partition from the linux live cd? I have no preference if my whole computer gets wiped, I have all the backups I need, I just want to be able to use my computer again. Here's a list of the partitions given by sudo gdisk -l /dev/sda.
Disk /dev/sda: 250069680 sectors, 119.2 GiB Logical sector size: 512 bytes Disk identifier (GUID): 5C489780-9031-436B-B6C1-4F0C29E16773 Partition table holds up to 128 entries First usable sector is 34, last usable sector is 500121566 Partitions will be aligned on 2048-sector boundaries Total free space is 6077 sectors (3.0 MiB) Number Start (sector) End (sector) Size Code Name 1 2048 1230847 600.0 MiB 2700 Basic data partition 2 1230848 1845247 300.0 MiB 0700 3 1845248 2107391 128.0 MiB 0C01 Microsoft reserved part 4 2107392 500117503 237.5 GiB EF00 Basic data partition
Here are some images of the partitions recognized by the windows 10 installation usb.
Message after trying to select Drive 1 Partition 1 for install is "Windows detected that the EFI system partition was formatted as NTFS. Format the EFI system partition as FAT32, and restart the installation." Of course if gparted worked this wouldn't be so bad, but it crashes every time I open it...