Public bug reported:

Using Ubuntu 17.10 Desktop 64 bit I am unable to start a gnome-session
on my local Ubuntu 17.04 Desktop inside a Xephyr server over SSH.  This
is probably the same bug as https://bugs.launchpad.net/ubuntu/+source
/gnome-session/+bug/1251281 but I don't see a fix for 17.10 and could
not add 17.10 to that bug report.  When I try, I get:
https://bugs.launchpad.net/ubuntu/+source/gnome-
session/+bug/1251281/+distrotask

Setup:

local PC is 64 bit Ubuntu Desktop 17.04 - fully updated
remote PC is 64 bit Ubuntu Desktop 17.10 - fully updated

start Xephyr on local PC using:

~$ Xephyr :2 -screen 1280x900 &

set up DISPLAY

~$ export DISPLAY=:2

ssh to remote PC

~$ ssh -YC user@remote

now logged into remote - do a simple test:

~$ xeyes

I see the xeyes open on my local desktop inside the Xephyr window
success. Press CTRL-C in terminal to exit xeyes.

Try to start gnome-session on remote with:

~$ gnome-session --debug

I get the following on the console:

gnome-session-binary[17018]: DEBUG(+): Enabling debugging
gnome-session-binary[17018]: DEBUG(+): hardware acceleration check failed: 
Child process exited with code 1
gnome-session-binary[17018]: WARNING: software acceleration check failed: Child 
process exited with code 1
gnome-session-binary[17018]: CRITICAL: We failed, but the fail whale is dead. 
Sorry....

I expected a non-accelerated gnome session to start inside the Xephyr
window. It does not.

** Affects: gnome-session (Ubuntu)
     Importance: Undecided
         Status: New

** Description changed:

  Using Ubuntu 17.10 Desktop 64 bit I am unable to start a gnome-session
  on my local Ubuntu 17.04 Desktop inside a Xephyr server over SSH.  This
  is probably the same bug as https://bugs.launchpad.net/ubuntu/+source
  /gnome-session/+bug/1251281 but I don't see a fix for 17.10 and could
  not add 17.10 to that bug report.  When I try, I get:
  https://bugs.launchpad.net/ubuntu/+source/gnome-
  session/+bug/1251281/+distrotask
  
  Setup:
  
  local PC is 64 bit Ubuntu Desktop 17.04 - fully updated
  remote PC is 64 bit Ubuntu Desktop 17.10 - fully updated
  
  start Xephyr on local PC using:
  
  ~$ Xephyr :2 -screen 1280x900 &
  
  set up DISPLAY
  
  ~$ export DISPLAY=:2
  
  ssh to remote PC
  
  ~$ ssh -YC user@remote
  
- noe logged into remote - do a simple test:
+ now logged into remote - do a simple test:
  
  ~$ xeyes
  
  I see the xeyes open on my local desktop inside the Xephyr window
  success. Press CTRL-C in terminal to exit xeyes.
  
  Try to start gnome-session on remote with:
  
  ~$ gnome-session --debug
  
  I get the following on the console:
  
  gnome-session-binary[17018]: DEBUG(+): Enabling debugging
  gnome-session-binary[17018]: DEBUG(+): hardware acceleration check failed: 
Child process exited with code 1
  gnome-session-binary[17018]: WARNING: software acceleration check failed: 
Child process exited with code 1
  gnome-session-binary[17018]: CRITICAL: We failed, but the fail whale is dead. 
Sorry....
  
  I expected a non-accelerated gnome session to start inside the Xephyr
  window. It does not.

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https://bugs.launchpad.net/bugs/1740286

Title:
  gnome-session fails over SSH to remote PC

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