Hi,
> As per my understanding with GPT we can have more than 4 primary
> partitions.
Yes you can have more.
Quite some loops on your system /dev/loop13, that's suspicious
some unclean loops or other device maps ?
Other than that your picture only show a little bit of the logfile
and I can't see the file that is associated with /dev/loop13.
So please check that file and then call
gdisk -l this-file-mapped-to-loop13
Do you see all partitions ? if not I assume an issue with the
disk size. Partition 5 is the last one and created with all rest
capacity. Maybe there was no rest capacity... again I'm just
guessing because there is only a portion of the complete picture
The actual error is on the mapping of that partition, which
usually fails because the requested entry does not exist, but it
can also fail because of no more loops available. Unfortunately
partx doesn't tell the reason why
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