Traceback (most recent call last):
  File "/usr/bin/hp-toolbox", line 38, in <module>
    from base.g import *
  File "/usr/lib/hplip/base/g.py", line 133, in <module>
    user_cfg = Config(prop.user_config_file)
  File "/usr/lib/hplip/base/g.py", line 103, in __init__
    f = file(filename, 'r')
IOError: [Errno 13] Permission denied: '/home/ron/.hplip.conf'