I downloaded the iso normally and pressed live (first option) and gave it.

How did you get to the Debian installer in that version? Because that is no longer a supported option to installing PureOS.

but, it was this version (2018-04-26) that I used and gave error.

You are using an old installer image, please use an up-to-date one like https://downloads.pureos.net/live/gnome/2018-04-26/ for installing PureOS.

There are now two threads in the Purism forum regarding these issues. In this post:

Going back, I did notice something that might be interesting. On the first reboot after the update, vt.handoff=7 is missing.

This was not fixed in the above due to https://bugs.debian.org/898511 ("git repository missing latest 0.9.3-2 upload")

Fixed in https://code.puri.sm/pureos/plymouth/commit/c6c31458c6e485c559c1757efbd6187a132f4a60 (uploaded as plymouth_0.9.3-1pureos1_amd64.changes)

wellton reminded me....The 5/9 update was the upgrade to linux-image-4.16.0-1 pkg. I failed to explicitly mention that.

Same problem here. My kernel is 4.16.8-gnu

On boot I am seeing

Yes, the package manager. There was no output from terminal when launched. I needed to determine another package version (Synergy) that was available, but if Synaptic is going to be dropped this ticket could be closed.

This could indeed be related to stripped firmware as the firmware we strip out (the intel nonfree firmware) indeed contain power management parts.

Coreboot splash screen (with Purism logo) provides that info. Are you using latest coreboot? Note that it is indeed fast in showing that but putting some higher timeout would annoy users who want fast boot :-/

Synaptic the package manager? Please attach the output from terminal once you launch it.
Also note that synaptic does not have (at least last time I checked) Wayland support nor do I know any effort to port it so it will most likely drop from archive in time.

Broken again. Please stop breaking dependencies! This should be trivial to automatically test.