Re: Doubts about partitioning, mounting points and bootloader
The boot flag is used by windows, linux doesn't use it. But some boards can't boot if there is no boot flag on any of the partitions, so it's good to have it. But it remains unused and it doesn't mean that partition is controlling grub.
Right now grub on the MBR would be from the latest install. If that is sda1, then sda1 is controlling grub2.
As for primary vs logical, linux doesn't care about that too. It works perfectly fine from either.
Yes, both installs can share the swap partition because you have only one booted at the same time anyway. But that red mark next to sda5 looks like there is something wrong with your swap partition.
You might need to delete it, create it again as swap area, and then in /etc/fstab on both installations replace the old UUID string with the new one (creating a new partition assigns new UUID to it).
You can check all partitions UUIDs with:
sudo blkid
As for resizing, it's possible but only if really, really need it. There is always risk involved things to go wrong, so you better have a full backup of your data before you start, and be ready if something goes wrong (like having the ubuntu cd of the same version at hand, get info what to do if the system stops booting, etc).
Darko.
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Ubuntu 18.04 LTS 64bit
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