In reply to Ryan Daly #20, ubuntu-desktop is only a meta-package. This means 
basically you could do "apt-get install ubuntu-desktop" and it will get 
everything you need automatically. Removing meta-packages won't actually 
remove, say, nautilus or network-manager. Apt will show you everything that 
will be removed if you try to pull out a package. On a command line, do apt-get 
remove gnome-power-manager, and it will show you all the packages that will be 
affected by the change, and will ask for a confirmation. For instance:
<code>
user@host:~/.cache/sessions$ sudo apt-get remove xubuntu-desktop 
[sudo] password for supreme: 
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following packages will be REMOVED:
  xubuntu-desktop
0 upgraded, 0 newly installed, 1 to remove and 0 not upgraded.
After this operation, 44.0 kB disk space will be freed.
Do you want to continue [Y/n]? 
</code>

Now, back on topic (sorry). I wish I had better news, but I have this
same issue again on a different machine. Same build type- Ubuntu with
Unity first, moved to XFCE later. I followed the steps I had posted
ealier and removed the unity and gnome power stuff. No dice this time.
XFCE power manager just doesn't like to start up.

What's more, this time I can't even start it on CLI via the --no-daemon option 
in order to get bug output, as it's already running. But it's a Zombie that 
can't be killed:
<code>
root@host:~# ps ax | grep power
 1402 ?        Sl     0:00 /usr/lib/upower/upowerd
 1926 ?        Ss     0:00 xfce4-power-manager
 2577 ?        Ss     0:00 xfce4-power-manager
 5212 pts/2    S+     0:00 grep --color=auto power

root@host:~# kill 1926
root@host:~# kill 2577

root@host:~# ps ax | grep power
 1402 ?        Sl     0:00 /usr/lib/upower/upowerd
 1926 ?        Ss     0:00 xfce4-power-manager
 2577 ?        Ss     0:00 xfce4-power-manager
 5214 pts/2    S+     0:00 grep --color=auto power
root@host:~# 
</code>

*sigh*

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https://bugs.launchpad.net/bugs/973778

Title:
  Unable to connect to Xfce Power Manager

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