It's been a long time since I installed anything, but since I was given this laptop so I thought I'd try to triple boot from it's current state of Windows 7 and Kubuntu 18.0.4 v5.12.4. I don't think it's possible without first:
Deleting the linux partition in Windows Disk Management.
Create an Extended partition in GParted (USB install.iso) with the unallocated space.
Create boot, /, /home, swap as ext4 logical partitions within the Extended partition.
If all this is correct what is the proper technique for installing the third OS with the remaining unallocated space to complete the triple boot installation. Do I create the same exact additional logical partitions again. I know I will be prompted as to the location of where to install grub. I'm not totally sure.
Output:
GPT fdisk (gdisk) version 1.0.5
Partition table scan:
MBR: MBR only
BSD: not present
APM: not present
GPT: not present
***************************************************************
Found invalid GPT and valid MBR; converting MBR to GPT format
in memory.
***************************************************************
Disk /dev/sda: 976773168 sectors, 465.8 GiB
Model: TOSHIBA MK5055GS
Sector size (logical/physical): 512/512 bytes
Disk identifier (GUID): 5BF792C9-9EBA-4361-A7B1-786AF5B0CECD
Partition table holds up to 128 entries
Main partition table begins at sector 2 and ends at sector 33
First usable sector is 34, last usable sector is 976773134
Partitions will be aligned on 2048-sector boundaries
Total free space is 2239 sectors (1.1 MiB)
Number Start (sector) End (sector) Size Code Name
1 2048 206847 100.0 MiB 0700 Microsoft basic data
2 206848 525930495 250.7 GiB 0700 Microsoft basic data
3 525930496 968564735 211.1 GiB 8300 Linux filesystem
4 968564736 976772909 3.9 GiB 8200 Linux swap
