ValueError: Invalid process ID: [Errno 2] No such file or directory: '/proc/199/stat'
ERROR: apport (pid 1443) Mon Dec 23 20:10:51 2013: pid: 1443, uid: 0, gid: 0, euid: 0, egid: 0
ERROR: apport (pid 1443) Mon Dec 23 20:10:51 2013: environment: environ({})
ERROR: apport (pid 1463) Mon Dec 23 20:10:56 2013: Unhandled exception:
Traceback (most recent call last):
  File "/usr/share/apport/apport", line 54, in drop_privileges
    stat = os.stat('/proc/%s/stat' % pid)
FileNotFoundError: [Errno 2] No such file or directory: '/proc/206/stat'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/share/apport/apport", line 276, in <module>
    drop_privileges(pid, True)
  File "/usr/share/apport/apport", line 56, in drop_privileges
    raise ValueError('Invalid process ID: ' + str(e))
ValueError: Invalid process ID: [Errno 2] No such file or directory: '/proc/206/stat'
ERROR: apport (pid 1463) Mon Dec 23 20:10:56 2013: pid: 1463, uid: 0, gid: 0, euid: 0, egid: 0
ERROR: apport (pid 1463) Mon Dec 23 20:10:56 2013: environment: environ({})
ERROR: apport (pid 1492) Mon Dec 23 20:10:59 2013: called for pid 1481, signal 6, core limit 0
ERROR: apport (pid 1492) Mon Dec 23 20:10:59 2013: executable: /usr/bin/unity8 (command line "unity8")
ERROR: apport (pid 1492) Mon Dec 23 20:10:59 2013: gdbus call error: Error: GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name org.gnome.SessionManager was not provided by any .service files

ERROR: apport (pid 1492) Mon Dec 23 20:10:59 2013: debug: session gdbus call:
ERROR: apport (pid 1492) Mon Dec 23 20:11:01 2013: wrote report /var/crash/_usr_bin_unity8.32011.crash