I see.
A question, please. Should the host and guest OSes have the same type of partition table?
During installation, at the Disks info shows this has a gpt table,

Disk dev/sda: 60 GiB, 64424509440 bytes, 125829120 sectors
Disklabel type: gpt
Disk indentifier: xxxxxxxxxxxxxx
Disk dev/loop0: 953.5 MiB, 999809024 bytes, 1952752 sectors

/dev/sr0: UUID= “2018-06-06-04-05-11-00” LABEL=“ISOIMAGE” TYPE=”iso9660” PTUUID=“xxxxxxx ”    PTTYPE=“dos”
/dev/loop0: TYPE=”squashfs”
/dev/sda: PTUUID=“xxxxxxxxxxx”  PTTYPE=”gpt”

my host system has,

Disk /dev/sda: 1000GB
Sector size (logical/physical): 512B/4096B
Partition Table: msdos
Disk Flags: 

Number  Start   End     Size    Type      File system     Flags
1      1049kB  313MB   312MB   primary   fat32           boot, esp
2      315MB   789GB   789GB   extended
5      315MB   13.5GB  13.2GB  logical   linux-swap(v1)
6      13.5GB  63.0GB  50.5GB  logical   ext4
7      50.5GB  789GB   738GB   logical   ext4

Do I then create a gpt or msdos partition table for the Guest OS (Devuan) because I wanted to create a separate /home? Now I come to partitioning and unsure what type of table to create.

I am launching from the desktop.
Pop-ups: choose su or sudo, I choose su then I get the yad refractoinstall popup. I think I'll bypass the desktop launch and try the cli this time.

thanks again.