Install successful but ask for reboot

[corrado venturini]

At end of successful installation (just install, not try-and-install) from Ubuntu 18.10 "Cosmic CANIMAL" - Alpha amd64 (20180505)
After "Installation is complete. You need to restart... restart now"
I click on "restart now"
I have a black screen with a message:
Please remove the installation medium, then reboot.
I removed the installation medium but message does not disappear.
I was forced to use hardware poweroff. At restart system works fine.

telemetry as follows:
{"Media": "Ubuntu 18.10 \"Cosmic CANIMAL\" - Alpha amd64 (20180505)", "Type": "GTK", "PartitionMethod": "manual", "DownloadUpdates": true, "Language": "en", "Minimal": false, "RestrictedAddons": true, "Stages": {"0": "language", "5": "console_setup", "10": "console_setup", "22": "prepare", "117": "partman", "124": "partman", "129": "partman", "150": "partman", "178": "partman", "182": "start_install", "183": "timezone", "186": "usersetup", "246": "user_done", "812": "done"}}

Installing from same ISO with try-and-install i found no problem: i see for a moment the same message
"Please remove the installation medium, then reboot." and then the system reboots automatically.

if needed I can attach /var/log/installer from just-install and try-and-install

same problem on 3 different hardware and also with Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)

[Kev Bowring (flocculant)]

This is a bug with whatever package runs the installer - not the testcase.