Problem when running sudo apt-get update

I get this;
pooky2483@pooky2483-Kubuntu-1404-120SSD:~$ sudo apt-get update
Ign http://archive.canonical.com trusty InRelease
Hit http://security.ubuntu.com trusty-security InRelease
Ign http://gb.archive.ubuntu.com trusty InRelease
Hit http://archive.canonical.com trusty Release.gpg
Ign http://extras.ubuntu.com trusty InRelease
Hit http://ppa.launchpad.net trusty InRelease
Ign http://dl.google.com stable InRelease
Hit http://ppa.launchpad.net trusty InRelease
Hit http://gb.archive.ubuntu.com trusty-updates InRelease
Hit http://archive.canonical.com trusty Release
Hit http://extras.ubuntu.com trusty Release.gpg
Ign http://ppa.launchpad.net trusty InRelease
Hit http://gb.archive.ubuntu.com trusty-backports InRelease
Hit http://dl.google.com stable Release.gpg
Hit http://ppa.launchpad.net trusty InRelease
Hit http://extras.ubuntu.com trusty Release
Hit http://gb.archive.ubuntu.com trusty Release.gpg
Hit http://security.ubuntu.com trusty-security/main Sources
Hit http://ppa.launchpad.net trusty InRelease
Hit http://gb.archive.ubuntu.com trusty Release
Hit http://security.ubuntu.com trusty-security/restricted Sources
Hit http://ppa.launchpad.net trusty InRelease
Hit http://security.ubuntu.com trusty-security/universe Sources
Ign http://ppa.launchpad.net trusty InRelease
Hit http://security.ubuntu.com trusty-security/multiverse Sources
Hit http://dl.google.com stable Release
Hit http://ppa.launchpad.net trusty InRelease
Hit http://gb.archive.ubuntu.com trusty-updates/main Sources
Hit http://security.ubuntu.com trusty-security/main amd64 Packages
Hit http://archive.canonical.com trusty/partner amd64 Packages
Hit http://ppa.launchpad.net trusty InRelease
Hit http://gb.archive.ubuntu.com trusty-updates/restricted Sources
Hit http://security.ubuntu.com trusty-security/restricted amd64 Packages
Hit http://archive.canonical.com trusty/partner i386 Packages
Hit http://ppa.launchpad.net trusty InRelease
Hit http://gb.archive.ubuntu.com trusty-updates/universe Sources
Hit http://security.ubuntu.com trusty-security/universe amd64 Packages
Hit http://archive.canonical.com trusty/partner Translation-en
Hit http://ppa.launchpad.net trusty Release.gpg
Hit http://gb.archive.ubuntu.com trusty-updates/multiverse Sources
Hit http://security.ubuntu.com trusty-security/multiverse amd64 Packages
Hit http://ppa.launchpad.net trusty/main amd64 Packages
Hit http://security.ubuntu.com trusty-security/main i386 Packages
Hit http://gb.archive.ubuntu.com trusty-updates/main amd64 Packages
Hit http://extras.ubuntu.com trusty/main amd64 Packages
Hit http://ppa.launchpad.net trusty/main i386 Packages
Hit http://security.ubuntu.com trusty-security/restricted i386 Packages
Hit http://gb.archive.ubuntu.com trusty-updates/restricted amd64 Packages
Hit http://security.ubuntu.com trusty-security/universe i386 Packages
Hit http://extras.ubuntu.com trusty/main i386 Packages
Hit http://ppa.launchpad.net trusty/main Translation-en
Hit http://gb.archive.ubuntu.com trusty-updates/universe amd64 Packages
Hit http://ppa.launchpad.net trusty/main amd64 Packages
Hit http://security.ubuntu.com trusty-security/multiverse i386 Packages
Hit http://gb.archive.ubuntu.com trusty-updates/multiverse amd64 Packages
Hit http://ppa.launchpad.net trusty/main i386 Packages
Hit http://security.ubuntu.com trusty-security/main Translation-en
Hit http://gb.archive.ubuntu.com trusty-updates/main i386 Packages
Hit http://ppa.launchpad.net trusty/main Translation-en
Hit http://security.ubuntu.com trusty-security/multiverse Translation-en
Hit http://gb.archive.ubuntu.com trusty-updates/restricted i386 Packages
Hit http://gb.archive.ubuntu.com trusty-updates/universe i386 Packages
Hit http://security.ubuntu.com trusty-security/restricted Translation-en
Hit http://security.ubuntu.com trusty-security/universe Translation-en
Hit http://gb.archive.ubuntu.com trusty-updates/multiverse i386 Packages
Hit http://dl.google.com stable/main amd64 Packages
Hit http://gb.archive.ubuntu.com trusty-updates/main Translation-en
Hit http://ppa.launchpad.net trusty Release.gpg
Hit http://ppa.launchpad.net trusty/main amd64 Packages
Hit http://ppa.launchpad.net trusty/main i386 Packages
Ign http://extras.ubuntu.com trusty/main Translation-en_GB
Hit http://ppa.launchpad.net trusty/main Translation-en
Ign http://extras.ubuntu.com trusty/main Translation-en
Hit http://dl.google.com stable/main i386 Packages
Hit http://gb.archive.ubuntu.com trusty-updates/multiverse Translation-en
Hit http://ppa.launchpad.net trusty Release
Hit http://gb.archive.ubuntu.com trusty-updates/restricted Translation-en
Hit http://ppa.launchpad.net trusty/main amd64 Packages
Hit http://gb.archive.ubuntu.com trusty-updates/universe Translation-en
Hit http://ppa.launchpad.net trusty/main i386 Packages
Hit http://gb.archive.ubuntu.com trusty-backports/main Sources
Hit http://ppa.launchpad.net trusty/main Translation-en
Hit http://gb.archive.ubuntu.com trusty-backports/restricted Sources
Hit http://ppa.launchpad.net trusty/main amd64 Packages
Hit http://gb.archive.ubuntu.com trusty-backports/universe Sources
Hit http://ppa.launchpad.net trusty/main i386 Packages
Hit http://ppa.launchpad.net trusty/main Translation-en
Hit http://gb.archive.ubuntu.com trusty-backports/multiverse Sources
Hit http://ppa.launchpad.net trusty/main amd64 Packages
Hit http://ppa.launchpad.net trusty/main i386 Packages
Hit http://gb.archive.ubuntu.com trusty-backports/main amd64 Packages
Hit http://ppa.launchpad.net trusty/main Translation-en
Hit http://gb.archive.ubuntu.com trusty-backports/restricted amd64 Packages
Hit http://ppa.launchpad.net trusty/main amd64 Packages
Hit http://gb.archive.ubuntu.com trusty-backports/universe amd64 Packages
Hit http://ppa.launchpad.net trusty/main i386 Packages
Hit http://ppa.launchpad.net trusty/main Translation-en
Hit http://gb.archive.ubuntu.com trusty-backports/multiverse amd64 Packages
Hit http://ppa.launchpad.net trusty/main amd64 Packages
Hit http://gb.archive.ubuntu.com trusty-backports/main i386 Packages
Hit http://gb.archive.ubuntu.com trusty-backports/restricted i386 Packages
Hit http://gb.archive.ubuntu.com trusty-backports/universe i386 Packages
Hit http://gb.archive.ubuntu.com trusty-backports/multiverse i386 Packages
Hit http://gb.archive.ubuntu.com trusty-backports/main Translation-en
Hit http://ppa.launchpad.net trusty/main i386 Packages
Hit http://gb.archive.ubuntu.com trusty-backports/multiverse Translation-en
Hit http://ppa.launchpad.net trusty/main Translation-en
Hit http://ppa.launchpad.net trusty Release
Hit http://ppa.launchpad.net trusty/main amd64 Packages
Hit http://ppa.launchpad.net trusty/main i386 Packages
Hit http://ppa.launchpad.net trusty/main Translation-en
Hit http://gb.archive.ubuntu.com trusty-backports/restricted Translation-en
Hit http://ppa.launchpad.net trusty/main amd64 Packages
Hit http://gb.archive.ubuntu.com trusty-backports/universe Translation-en
Hit http://ppa.launchpad.net trusty/main i386 Packages
Hit http://gb.archive.ubuntu.com trusty/main Sources
Hit http://ppa.launchpad.net trusty/main Translation-en
Hit http://gb.archive.ubuntu.com trusty/restricted Sources
Hit http://gb.archive.ubuntu.com trusty/universe Sources
Hit http://gb.archive.ubuntu.com trusty/multiverse Sources
Hit http://gb.archive.ubuntu.com trusty/main amd64 Packages
Hit http://gb.archive.ubuntu.com trusty/restricted amd64 Packages
Hit http://gb.archive.ubuntu.com trusty/universe amd64 Packages
Hit http://gb.archive.ubuntu.com trusty/multiverse amd64 Packages
Hit http://gb.archive.ubuntu.com trusty/main i386 Packages
Hit http://gb.archive.ubuntu.com trusty/restricted i386 Packages
Hit http://gb.archive.ubuntu.com trusty/universe i386 Packages
Ign http://dl.google.com stable/main Translation-en_GB
Hit http://gb.archive.ubuntu.com trusty/multiverse i386 Packages
Hit http://gb.archive.ubuntu.com trusty/main Translation-en_GB
Hit http://gb.archive.ubuntu.com trusty/main Translation-en
Ign http://dl.google.com stable/main Translation-en
Hit http://gb.archive.ubuntu.com trusty/multiverse Translation-en_GB
Hit http://gb.archive.ubuntu.com trusty/multiverse Translation-en
Hit http://gb.archive.ubuntu.com trusty/restricted Translation-en_GB
Hit http://gb.archive.ubuntu.com trusty/restricted Translation-en
Hit http://gb.archive.ubuntu.com trusty/universe Translation-en_GB
Hit http://gb.archive.ubuntu.com trusty/universe Translation-en
Reading package lists… Done
W: Ignoring Provides line with DepCompareOp for package pypy-cffi
W: Ignoring Provides line with DepCompareOp for package pypy-cffi-backend-api-max
W: Ignoring Provides line with DepCompareOp for package pypy-cffi-backend-api-min
W: Ignoring Provides line with DepCompareOp for package python-cffi-backend-api-max
W: Ignoring Provides line with DepCompareOp for package python-cffi-backend-api-min
W: Ignoring Provides line with DepCompareOp for package python3-cffi-backend-api-max
W: Ignoring Provides line with DepCompareOp for package python3-cffi-backend-api-min
W: Ignoring Provides line with DepCompareOp for package python-cffi-backend-api-max
W: Ignoring Provides line with DepCompareOp for package python-cffi-backend-api-min
W: Ignoring Provides line with DepCompareOp for package python3-cffi-backend-api-max
W: Ignoring Provides line with DepCompareOp for package python3-cffi-backend-api-min

W: You may want to run apt-get update to correct these problems ← I just DID
pooky2483@pooky2483-Kubuntu-1404-120SSD:~$

I want to install mkvtoolnix-gui but I am unable to…

pooky2483@pooky2483-Kubuntu-1404-120SSD:~$ sudo apt-get install mkvtoolnix-gui
Reading package lists… Done
Building dependency tree
Reading state information… Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies.
mkvtoolnix-gui : Depends: libwxbase3.0-0 (>= 3.0.0) but it is not going to be installed
Depends: libwxgtk3.0-0 (>= 3.0.0) but it is not going to be installed
E: Unable to correct problems, you have held broken packages.
pooky2483@pooky2483-Kubuntu-1404-120SSD:~$

Try running

sudo apt-get update -y && sudo apt-get upgrade -y

now if you run:

sudo apt-get update, do you still get the errors ?

Have you tried instaling libwxgtk3.0-0 first … or at the same time

sudo apt-get install libwxgtk3.0-0 mkvtoolnix-gui

so did the command you ran (

I just ran it after and got;

pooky2483@pooky2483-Kubuntu-1404-120SSD:~$ sudo apt-get install libwxgtk3.0-0 mkvtoolnix-gui
Reading package lists… Done
Building dependency tree
Reading state information… Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies.
libwxgtk3.0-0 : Depends: libwxbase3.0-0 (>= 3.0.2) but it is not going to be installed
mkvtoolnix-gui : Depends: libwxbase3.0-0 (>= 3.0.0) but it is not going to be installed
E: Unable to correct problems, you have held broken packages.
pooky2483@pooky2483-Kubuntu-1404-120SSD:~$