ubuntu-settings-migrate-to-defaults.18.10.0.py crashed with KeyError in __getitem__(): 'DESKTOP_SESSION'

Status changed to 'Confirmed' because the bug affects multiple users.

Thanks - I got this too from the gdm-wayland-session.

Traceback (most recent call last):
  File "/usr/share/session-migration/scripts/ubuntu-settings-migrate-to-defaults.18.10.0.py", line 35, in <module>
    if os.environ['DESKTOP_SESSION'] != 'ubuntu':
  File "/usr/lib/python3.6/os.py", line 669, in __getitem__
    raise KeyError(key) from None
KeyError: 'DESKTOP_SESSION'

Marco, would be good if you could look if you've got time, thanks!

on new install from Ubuntu 18.10 "Cosmic Cuttlefish" - Alpha amd64 (20180906)
just started after install

corrado@corrado-p9-cc-0906:~$ inxi -Fx
System: Host: corrado-p9-cc-0906 Kernel: 4.17.0-9-generic x86_64 bits: 64 compiler: gcc v: 8.2.0
           Desktop: Gnome 3.30.0 Distro: Ubuntu 18.10 (Cosmic Cuttlefish)
Machine: Type: Desktop Mobo: ASRock model: H110M-G/M.2 serial: <root required> UEFI: American Megatrends
           v: P1.10 date: 05/11/2017
CPU: Topology: Dual Core model: Intel Core i3-7100 bits: 64 type: MT MCP arch: Skylake rev: 9
           L2 cache: 3072 KiB
           flags: lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx bogomips: 31296
           Speed: 800 MHz min/max: 800/3900 MHz Core speeds (MHz): 1: 800 2: 800 3: 800 4: 800
Graphics: Device-1: Intel HD Graphics 630 driver: i915 v: kernel bus ID: 00:02.0
           Display: x11 server: X.Org 1.20.1 driver: i915 resolution: 1920x1080~60Hz
           OpenGL: renderer: Mesa DRI Intel HD Graphics 630 (Kaby Lake GT2) v: 4.5 Mesa 18.1.5
           direct render: Yes
Audio: Device-1: Intel 100 Series/C230 Series Family HD Audio driver: snd_hda_intel v: kernel
           bus ID: 00:1f.3
           Sound Server: ALSA v: k4.17.0-9-generic
Network: Device-1: Intel Ethernet I219-V driver: e1000e v: 3.2.6-k port: N/A bus ID: 00:1f.6
           IF: enp0s31f6 state: up speed: 100 Mbps duplex: full mac: 70:85:c2:44:7b:86
Drives: Local Storage: total: 931.51 GiB used: 4.32 GiB (0.5%)
           ID-1: /dev/sda vendor: Toshiba model: DT01ACA100 size: 931.51 GiB temp: 37 C
Partition: ID-1: / size: 15.62 GiB used: 4.31 GiB (27.6%) fs: ext4 dev: /dev/sda9
           ID-2: swap-1 size: 8.00 GiB used: 0 KiB (0.0%) fs: swap dev: /dev/sda2
Sensors: System Temperatures: cpu: 44.0 C mobo: N/A
           Fan Speeds (RPM): N/A
Info: Processes: 212 Uptime: 6m Memory: 7.50 GiB used: 1.10 GiB (14.6%) Init: systemd Compilers: gcc: N/A
           Shell: bash v: 4.4.19 inxi: 3.0.22
corrado@corrado-p9-cc-0906:~$

This bug was fixed in the package gnome-session - 3.30.0-0ubuntu2

---------------
gnome-session (3.30.0-0ubuntu2) cosmic; urgency=medium

  * debian/ubuntu-settings-migrate-to-defaults.18.10.0.py:
    - use getenv instead of environ[], as the session env key is
      missing for instance under gdm. (LP: #1790532)
    - add missing sys import (LP: #1791100)

 -- Didier Roche <email address hidden> Fri, 07 Sep 2018 08:58:23 +0200