how to fix this

The PPA doesn't support your release and should be removed.

If you start adding 3rd party packages sources, don't be surprised when you get issues.

You can use software centre to remove the PPA, or delete the relevant files for the PPA in /etc/apt/sources.list.d

idont know what 3rd party packages i installed before. can you help me, please. im new user & didnt quite understand about it

this is just show of gedit /etc/apt/sources.list

# deb cdrom:[Ubuntu 13.04 _Raring Ringtail_ - Release i386 (20130424)]/ raring main restricted

# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.
deb http://id.archive.ubuntu.com/ubuntu/ raring main restricted
deb-src http://id.archive.ubuntu.com/ubuntu/ raring main restricted

## Major bug fix updates produced after the final release of the
## distribution.
deb http://id.archive.ubuntu.com/ubuntu/ raring-updates main restricted
deb-src http://id.archive.ubuntu.com/ubuntu/ raring-updates main restricted

## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team. Also, please note that software in universe WILL NOT receive any
## review or updates from the Ubuntu security team.
deb http://id.archive.ubuntu.com/ubuntu/ raring universe
deb-src http://id.archive.ubuntu.com/ubuntu/ raring universe
deb http://id.archive.ubuntu.com/ubuntu/ raring-updates universe
deb-src http://id.archive.ubuntu.com/ubuntu/ raring-updates universe

## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team, and may not be under a free licence. Please satisfy yourself as to
## your rights to use the software. Also, please note that software in
## multiverse WILL NOT receive any review or updates from the Ubuntu
## security team.
deb http://id.archive.ubuntu.com/ubuntu/ raring multiverse
deb-src http://id.archive.ubuntu.com/ubuntu/ raring multiverse
deb http://id.archive.ubuntu.com/ubuntu/ raring-updates multiverse
deb-src http://id.archive.ubuntu.com/ubuntu/ raring-updates multiverse

## N.B. software from this repository may not have been tested as
## extensively as that contained in the main release, although it includes
## newer versions of some applications which may provide useful features.
## Also, please note that software in backports WILL NOT receive any review
## or updates from the Ubuntu security team.
deb http://id.archive.ubuntu.com/ubuntu/ raring-backports main restricted universe multiverse
deb-src http://id.archive.ubuntu.com/ubuntu/ raring-backports main restricted universe multiverse

deb http://security.ubuntu.com/ubuntu raring-security main restricted
deb-src http://security.ubuntu.com/ubuntu raring-security main restricted
deb http://security.ubuntu.com/ubuntu raring-security universe
deb-src http://security.ubuntu.com/ubuntu raring-security universe
deb http://security.ubuntu.com/ubuntu raring-security multiverse
deb-src http://security.ubuntu.com/ubuntu raring-security multiverse

## Uncomment the following two lines to add software from Canonical's
## 'partner' repository.
## This software is not part of Ubuntu, but is offered by Canonical and the
## respective vendors as a service to Ubuntu users.
# deb http://archive.canonical.com/ubuntu raring partner
# deb-src http://archive.canonical.com/ubuntu raring partner

## This software is not part of Ubuntu, but is offered by third-party
## developers who want to ship their latest software.
deb http://extras.ubuntu.com/ubuntu raring main
deb-src http://extras.ubuntu.com/ubuntu raring main

let me know what 3rd party package must be removed?

It's not in there. When you follow the how to guides and they suggest adding extra package sources they fail to tell users that issues can happen and this sort of thing happens as well.

What is the output of :

grep globalmenu /etc/apt/sources.list.d/*

Thanks

/etc/apt/sources.list.d/globalmenu-team-ppa-raring.list:deb http://ppa.launchpad.net/globalmenu-team/ppa/ubuntu raring main
/etc/apt/sources.list.d/globalmenu-team-ppa-raring.list:# deb-src http://ppa.launchpad.net/globalmenu-team/ppa/ubuntu raring main
/etc/apt/sources.list.d/globalmenu-team-ppa-raring.list.save:deb http://ppa.launchpad.net/globalmenu-team/ppa/ubuntu raring main
/etc/apt/sources.list.d/globalmenu-team-ppa-raring.list.save:# deb-src http://ppa.launchpad.net/globalmenu-team/ppa/ubuntu raring main

sudo rm /etc/apt/sources.list.d/globalmenu-team-ppa-raring.list

sudo apt-get update

Will now be smoother.

problem solved
thanks a lot