The default "device for bootloader installation" is /dev/sda (the first disk; GRUB is then installed in its MBR) not /dev/sda1 (the first partition of the first disk). But, if at the boot, GRUB shows up, then it should be OK... unless it is the GRUB installed in one of your previous tries. Probably installed in /dev/sda's MBR. No error message after you choose Trisquel in GRUB's menu? GRUB can be (re)installed. But it is simpler to tell you "reinstall Trisquel and specify let /dev/sda as the "device for bootloader installation".

As far as I understand, /dev/sdb1 is the root partition and you put /home on another disk, right? You need a /home partition (otherwise you would have 24 GB for both the system and the user data). In the screenshot, you ask about the "Volume name". It actually is a number of 32 hexadecimal digits. It identifies the partition: https://en.wikipedia.org/wiki/Universally_unique_identifier

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