I had this problem with our internal KB system, it doesn't support php 5.3 and the developer isn't supporting our version any longer so he won't upgrade it, whatever.
Copy this text and put it in "/etc/apt/sources.list.d" as "karmic_0.list:
# deb cdrom:[Ubuntu 10.04 LTS _Lucid Lynx_ - Release amd64 (20100429)]/ karmic main restricted
# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.
deb http://us.archive.ubuntu.com/ubuntu/ karmic main restricted
deb-src http://us.archive.ubuntu.com/ubuntu/ karmic main restricted
## Major bug fix updates produced after the final release of the
## distribution.
deb http://us.archive.ubuntu.com/ubuntu/ karmic-updates main restricted
deb-src http://us.archive.ubuntu.com/ubuntu/ karmic-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://us.archive.ubuntu.com/ubuntu/ karmic universe
deb-src http://us.archive.ubuntu.com/ubuntu/ karmic universe
deb http://us.archive.ubuntu.com/ubuntu/ karmic-updates universe
deb-src http://us.archive.ubuntu.com/ubuntu/ karmic-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://us.archive.ubuntu.com/ubuntu/ karmic multiverse
deb-src http://us.archive.ubuntu.com/ubuntu/ karmic multiverse
deb http://us.archive.ubuntu.com/ubuntu/ karmic-updates multiverse
deb-src http://us.archive.ubuntu.com/ubuntu/ karmic-updates multiverse
## Uncomment the following two lines to add software from the 'backports'
## repository.
## 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://us.archive.ubuntu.com/ubuntu/ karmic-backports main restricted universe multiverse
# deb-src http://us.archive.ubuntu.com/ubuntu/ karmic-backports main restricted universe 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 karmic partner
# deb-src http://archive.canonical.com/ubuntu karmic partner
deb http://security.ubuntu.com/ubuntu karmic-security main restricted
deb-src http://security.ubuntu.com/ubuntu karmic-security main restricted
deb http://security.ubuntu.com/ubuntu karmic-security universe
deb-src http://security.ubuntu.com/ubuntu karmic-security universe
deb http://security.ubuntu.com/ubuntu karmic-security multiverse
deb-src http://security.ubuntu.com/ubuntu karmic-security multiverse
Copy this and put it in "/etc/apt/preferences.d" as "php" (no extension):
Package: php5-gd
Pin: release a=karmic
Pin-Priority: 991
Package: php5-common
Pin: release a=karmic
Pin-Priority: 991
Package: php5-curl
Pin: release a=karmic
Pin-Priority: 991
Package: php5-mysql
Pin: release a=karmic
Pin-Priority: 991
Package: php5-pear
Pin: release a=karmic
Pin-Priority: 991
Package: php5-xsl
Pin: release a=karmic
Pin-Priority: 991
Package: php5-adodb
Pin: release a=karmic
Pin-Priority: 991
Package: php5-snmp
Pin: release a=karmic
Pin-Priority: 991
Package: php5-ldap
Pin: release a=karmic
Pin-Priority: 991
Package: php-pear
Pin: release a=karmic
Pin-Priority: 991
Package: php5-cli
Pin: release a=karmic
Pin-Priority: 991
Package: php5-mcrypt
Pin: release a=karmic
Pin-Priority: 991
Package: php5-memcache
Pin: release a=karmic
Pin-Priority: 991
Package: php5-pgsql
Pin: release a=karmic
Pin-Priority: 991
Package: libapache2-mod-php5
Pin: release a=karmic
Pin-Priority: 991
Then run the following commands to remove and reinstall PHP5 as the earlier version:
apt-get update
apt-get remove php5 libapache2-mod-php5 php5-gd php-pear php5-mysql php5-curl php5-memcache php5-mcrypt phpmyadminapt-get install php5 libapache2-mod-php5 php5-gd php-pear php5-mysql php5-curl php5-memcache php5-mcrypt phpmyadmin
After that you should be all set, I installed phpmyadmin for my own purposes you can choose to leave it out if you want.
