I have a dual boot system (Ubuntu 18.04 & Windows 10) with 4 primary partitions - the system reserved partition (boot), the windows partition, the ubuntu partition (has /boot, /root, /home, etc) and the swap partition for ubuntu. I want to create another partition (for sharing between windows and ubuntu) and so I need to convert the ubuntu and swap partitions into logical partitions. I did that using fixparts (using this), but on rebooting, I got the grub rescue prompt. While I was able to recover by booting into a live CD and changing the partitions back into primary partitions, I would still like to change the partitions into logical partitions and still have a working system.
What do I need to do here?
Edit 1: More info on UUID
Yes, when I convert the partitions to logical, the UUID does change. After edits with fixparts, when I reload gparted to view the partition information, I don't get an UUID for the partitions at all. I also get this error when I try to get additional information on the partitions:
for /dev/sda5 (the erstwhile primary partition with Ubuntu root, boot etc):
e2label: No such file or directory while trying to open /dev/sda5 Couldn't find valid filesystem superblock. tune2fs 1.44.1 (24-Mar-2018) tune2fs: No such file or directory while trying to open /dev/sda5 Couldn't find valid filesystem superblock. Couldn't find valid filesystem superblock. dumpe2fs 1.44.1 (24-Mar-2018) dumpe2fs: No such file or directory while trying to open /dev/sda5 Unable to read the contents of this file system! Because of this some operations may be unavailable. The cause might be a missing software package. The following list of software packages is required for ext4 file system support: e2fsprogs v1.41+.
Edit 2: From here: "Note that the /boot directory must be located on a filesystem that is supported by GRUB. Not all filesystems are. The function of stage 1.5 is to begin execution with the filesystem drivers necessary to locate the stage 2 files in the /boot filesystem and load the needed drivers. This means that stage 2 of GRUB2 can be located on a standard EXT filesystem but it cannot be located on a logical volume. So the standard location for the stage 2 files is in the /boot filesystem, specifically /boot/grub2."
This seems to imply that I can't convert to logical partition for /boot?