lubuntu impish install alongside failure

ubuntu-bug on actual report keep abending with network problem (502 bad gateway) so I'm filing on my primary box and will apport-collect on dc7700 or actual box shortly

** Details

Lubuntu QA-test install on
- hp dc7700 (c2d-e6320, 5gb, nvidia quadro nvs 290)

Testcase: install alongside
(system had a full disk install performed earlier today; this was 2nd install that would shrink prior install partition to create space & install alongside).

Calamares just QUIT during install process. Screensaver had kicked in, so I can't say exactly where it was up to, i was using other system logging issue with jerky-display when I woke it from screensaver & almost instantly the calamares screen closed without message.

calamares crash report in /var/crash

I tried multiple times (`ubuntu-bug /var/crash/....crash`) it failed always at 99% with network issue and "HTTP Error 502: Bad Gateway" so I tried again with `sudo` to same results.

I switched to my primary box and filed bug here.
On dc7700 box I then `apport-collect 1945544`

At that point I get

"The authorization page:
 (https//launchpad.net/+authorize-token-d.....)
should be opening in your browser. Use your browser to authorize
this program to access Launchpad on your behalf"

at which point the box just stopped pretty much
- mouse clicks do nothing (can't select/click on anything)
- keyboard appears to do nothing (inc. Ctrl+Alt+F4, Ctrl+Alt+T won't let me switch to a terminal to explore)

however mouse-pointer moves around... so kernel & parts of system are still up!

I fear the calamares bug crash report however is gone..

I can always repeat this install (I think it was near the end at the expand packages stage) -- but I fear firefox may have an issue because of the deb/snap change for flavors (unless it's a networking or box issue!)
---
ProblemType: Bug
.etc.calamares.modules.finished.conf:
 ---
 restartNowMode: user-checked
 restartNowCommand: "systemctl -i reboot"
.etc.calamares.modules.shellprocess_logs.conf:
 ---
 dontChroot: true
 timeout: 30
 script:
     - calamares-logs-helper @@ROOT@@
.etc.calamares.modules.unpackfs.conf:
 ---
 unpack:
     - source: "/cdrom/casper/filesystem.squashfs"
         sourcefs: "squashfs"
         destination: ""
ApportVersion: 2.20.11-0ubuntu69
Architecture: amd64
CasperMD5CheckResult: pass
CasperVersion: 1.465
CurrentDesktop: LXQt
DistroRelease: Ubuntu 21.10
LiveMediaBuild: Lubuntu 21.10 "Impish Indri" - Beta amd64 (20210928)
Package: calamares 3.2.41.1-0ubuntu1
PackageArchitecture: amd64
ProcVersionSignature: Ubuntu 5.13.0-16.16-generic 5.13.13
RelatedPackageVersions:
 calamares-settings-ubuntu-common 1:21.10.2
 calamares-settings-lubuntu 1:21.10.2
 xfsprogs 5.10.0-4ubuntu1
 btrfs-progs 5.10.1-2
Tags: impish
Uname: Linux 5.13.0-16-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin lxd plugdev sambashare sudo
_MarkForUpload: True