For the 'gksudo' problem, edit your /etc/apt/sources.list.d/upubuntu- com-tor64-saucy.list file and remove the 'gksudo' typo. See the sources.list(5) manpage for details on the correct format of the apt sources files:
man 5 sources.list Thanks -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to policykit-1 in Ubuntu. https://bugs.launchpad.net/bugs/1275908 Title: pkexec crashed with SIGABRT in g_assertion_message() Status in “policykit-1” package in Ubuntu: Invalid Bug description: No more info to offer. ProblemType: Crash DistroRelease: Ubuntu 14.04 Package: policykit-1 0.105-4ubuntu1 ProcVersionSignature: Ubuntu 3.13.0-6.23-generic 3.13.0 Uname: Linux 3.13.0-6-generic i686 ApportVersion: 2.13.2-0ubuntu2 Architecture: i386 CrashCounter: 1 CurrentDesktop: Unity Date: Mon Feb 3 14:17:47 2014 ExecutablePath: /usr/bin/pkexec InstallationDate: Installed on 2014-01-11 (23 days ago) InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release i386 (20130424) ProcAttrCurrent: /usr/lib/lightdm/lightdm-guest-session (enforce) ProcCmdline: pkexec /usr/lib/gnome-settings-daemon/gsd-backlight-helper --set-brightness 3 ProcEnviron: PATH=(custom, no user) LANGUAGE=en_CA:en XDG_RUNTIME_DIR=<set> LANG=en_CA.UTF-8 SHELL=/bin/bash Signal: 6 SourcePackage: policykit-1 StacktraceTop: g_assertion_message () from /lib/i386-linux-gnu/libglib-2.0.so.0 g_assertion_message_expr () from /lib/i386-linux-gnu/libglib-2.0.so.0 ?? () __libc_start_main (main=0x80497f0, argc=4, argv=0xbf9de964, init=0x804b0a0, fini=0x804b110, rtld_fini=0xb776c0f0 <_dl_fini>, stack_end=0xbf9de95c) at libc-start.c:287 ?? () Title: pkexec crashed with SIGABRT in g_assertion_message() UpgradeStatus: Upgraded to trusty on 2014-01-18 (16 days ago) UserGroups: To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/policykit-1/+bug/1275908/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp