Since upgrading to 13.10, I no longer have the 'privileges' to do the following things:

1. Mount USB/CDROM drives
2. Run software centre or software updater
3. Press the GUI shut down or restart buttons
4. Unlock my account in the 'settings - user accounts' section (padlock is greyed out)

Also, when logging on as a guest user I get error messages relating to Compiz crashing with SIGSEGV and it hangs on a blank wallpaper screen.

However, I still am able to use sudo in the terminal.

Output of 'groups' is

jenchris adm dialout cdrom sudo audio video plugdev lpadmin admin pulse pulse-access sambashare

sudo usermod -U username doesn't have any effect

Output of sudo dpkg-reconfigure -phigh -a

acpid stop/waiting
acpid start/running, process 30454
 * Starting AppArmor profiles                                                   Skipping profile in /etc/apparmor.d/disable: usr.bin.firefox
Skipping profile in /etc/apparmor.d/disable: usr.sbin.rsyslogd
                                                                         [ OK ]
 * Reloading AppArmor profiles                                                  Skipping profile in /etc/apparmor.d/disable: usr.bin.firefox
Skipping profile in /etc/apparmor.d/disable: usr.sbin.rsyslogd
                                                                         [ OK ]
apport stop/waiting
apport start/running
gpg: key 437D05B5: "Ubuntu Archive Automatic Signing Key <[email protected]>" not changed
gpg: key FBB75451: "Ubuntu CD Image Automatic Signing Key <[email protected]>" not changed
gpg: key C0B21F32: "Ubuntu Archive Automatic Signing Key (2012) <[email protected]>" not changed
gpg: key EFE21092: "Ubuntu CD Image Automatic Signing Key (2012) <[email protected]>" not changed
gpg: Total number processed: 4
gpg:              unchanged: 4
atd stop/waiting
atd start/running, process 1388
avahi-daemon stop/waiting
avahi-daemon start/running, process 1521
Rebuilding /usr/share/applications/bamf-2.index...
update-alternatives: using /usr/share/man/man7/bash-builtins.7.gz to provide /usr/share/man/man7/builtins.7.gz (builtins.7.gz) in auto mode
update-binfmts: warning: current package is openjdk-7, but binary format already installed by openjdk-6
binfmt-support stop/waiting
bluetooth stop/waiting
bluetooth start/running, process 4255
update-initramfs: deferring update (trigger activated)
/var/lib/dpkg/info/compiz.config: 1: /var/lib/dpkg/info/compiz.config: [general]: not found
/var/lib/dpkg/info/compiz.config: 2: /var/lib/dpkg/info/compiz.config: backend: not found
/var/lib/dpkg/info/compiz.config: 3: /var/lib/dpkg/info/compiz.config: plugin_list_autosort: not found
/var/lib/dpkg/info/compiz.config: 5: /var/lib/dpkg/info/compiz.config: [gnome_session]: not found
/var/lib/dpkg/info/compiz.config: 6: /var/lib/dpkg/info/compiz.config: backend: not found
/var/lib/dpkg/info/compiz.config: 7: /var/lib/dpkg/info/compiz.config: integration: not found
/var/lib/dpkg/info/compiz.config: 8: /var/lib/dpkg/info/compiz.config: plugin_list_autosort: not found
/var/lib/dpkg/info/compiz.config: 9: /var/lib/dpkg/info/compiz.config: profile: not found
/var/lib/dpkg/info/compiz.config: 11: /var/lib/dpkg/info/compiz.config: [general_ubuntu]: not found
/var/lib/dpkg/info/compiz.config: 12: /var/lib/dpkg/info/compiz.config: backend: not found
/var/lib/dpkg/info/compiz.config: 13: /var/lib/dpkg/info/compiz.config: integration: not found
/var/lib/dpkg/info/compiz.config: 14: /var/lib/dpkg/info/compiz.config: plugin_list_autosort: not found
/var/lib/dpkg/info/compiz.config: 15: /var/lib/dpkg/info/compiz.config: profile: not found