Unable to capture exposure with ASI183MM on Crouton Chromebook #45110
The problem here was the Chromebook.
Kstars/Ekos/INDI runs fine under a Linux chroot, Crouton, on a Chromebook.
My difficulty was that the INDI 3rd party "driver", asi-common, is really necessary to expose a full frame (but not necessary for a smaller region of interest). But asi-common will not work on Crouton installed on factory Chromebook.
Instead, because of the way systemd works, the asi-common rule must be installed in the Chrome root file system. Trouble is, this file system is mounted read-only in a factory Chromebook. For this Chromebook (Asus 523) this involved using a SuzyQable to remove the write protection from / and manually copying the asi-common rule file to /etc/udev/rules.d outside the chroot.
Just in case someone else encounters this problem.