Problem updating from 2.8.0-pre to 2.8.2

Hello everybody,
I wanted to update from linuxcnc from 2.8.0 to 2.8.2. I did a fresh install of the 2.8.2 iso on a new harddrive and copied my
config folder to the new drive. (no hardwarechange, except the drive)
When I start linuxcnc with my working machineconfig under 2.8.2 it throws some python errors and doesn't start.
Because the errors belong to files in /usr/lib I don't think my machineconfiguration is the reason. 
I just copied the errors from the output of linuxcnc running my ini file:


Starting LinuxCNC...
application-specific initialization failed: couldn't connect to display "axis"
Error in startup script: invalid command name "."
    while executing
". configure -borderwidth 0 -highlightthickness 0"
    (file "/usr/lib/tcltk/linuxcnc/bin/popimage" line 35)


and after loading the Mesa card it shows


Found file(REL): ./custom.hal
Traceback (most recent call last):
  File "/usr/bin/hal_manualtoolchange", line 62, in <module>
    app = Tkinter.Tk(className="AxisToolChanger")
  File "/usr/lib/python2.7/lib-tk/Tkinter.py", line 1828, in __init__
    self.tk = _tkinter.create(screenName, baseName, className, interactive, wantobjects, useTk, sync, use)
_tkinter.TclError: couldn't connect to display "axis"
Traceback (most recent call last):
  File "/usr/bin/axis", line 121, in <module>
    root_window = Tkinter.Tk(className="Axis")
  File "/usr/bin/axis", line 44, in __init__
    OldTk.__init__(self, *args, **kw)
  File "/usr/lib/python2.7/lib-tk/Tkinter.py", line 1828, in __init__
    self.tk = _tkinter.create(screenName, baseName, className, interactive, wantobjects, useTk, sync, use)
_tkinter.TclError: couldn't connect to display "axis"
Shutting down and cleaning up LinuxCNC...
Traceback (most recent call last):
  File "/usr/bin/axis-remote", line 78, in <module>
    t = Tkinter.Tk(); t.wm_withdraw()
  File "/usr/lib/python2.7/lib-tk/Tkinter.py", line 1828, in __init__
    self.tk = _tkinter.create(screenName, baseName, className, interactive, wantobjects, useTk, sync, use)
_tkinter.TclError: couldn't connect to display "axis"
Running HAL shutdown script
task: 49 cycles, min=0.000069, max=0.010266, avg=0.007056, 0 latency excursions (> 10x expected cycle time of 0.010000s)
A non blocked signal was caught
hm2_eth: in hm2_eth_reset

advice is appreciated...

Can you run an Axis sim?

Yes Axis sim runs fine.

Then its something in your config that is not liked.
Sometimes when I get stuff like this, I make a new config from scratch with pncconf (stepconf would work) using rubbish values to get it done quick then copy and paste my ini file and hal files to the new config.

I also tried to start the machine and now linuxcnc is showing a different error.
It seems I have to rebuild my hal and ini from scratch...
Not too enthusiastic about that...

hm2/hm2_7i76e.0: registered
Found file(REL): ./custom.hal
note: MAXV max: 166.667 units/sec 10000.000 units/min
note: LJOG max: 166.667 units/sec 10000.000 units/min
note: LJOG default: 6.000 units/sec 360.000 units/min
note: jog_order='XYZ'
note: jog_invert=set([])
Traceback (most recent call last):
File "/usr/bin/axis", line 4149, in <module>
_dynamic_tabs(inifile)
File "/usr/bin/axis", line 3981, in _dynamic_tabs
child = Popen(cmd)
File "/usr/lib/python2.7/subprocess.py", line 394, in __init__
errread, errwrite)
File "/usr/lib/python2.7/subprocess.py", line 1047, in _execute_child
raise child_exception
OSError: [Errno 2] No such file or directory
Shutting down and cleaning up LinuxCNC...

Found the error. I had a camera module installed, for whhich mplayer was needed and not installed. I would have expected other errors,. Now everything runs fine.