It’s not difficult but make sure about some config in your application before doing them. Because Ubuntu will not support Breezy-Badgers in 6 months, but Dapper Drake is LTS (Long Term Support) it suitable for server.
My step is
- backup old sources.list : cp /etc/apt/sources.list /etc/apt/sources.list.breezy
- change sourcelist to
deb http://th.archive.ubuntu.com/ubuntu/ dapper main restricted
deb-src http://th.archive.ubuntu.com/ubuntu/ dapper main restricted
## Major bug fix updates produced after the final release of the
## distribution.
deb http://th.archive.ubuntu.com/ubuntu/ dapper-updates main restricted
deb-src http://th.archive.ubuntu.com/ubuntu/ dapper-updates main restricted
## Uncomment the following two lines to add software from the ‘universe’
## repository.
## 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
## universe WILL NOT receive any review or updates from the Ubuntu security
## team.
deb http://th.archive.ubuntu.com/ubuntu/ dapper universe multiverse
deb-src http://th.archive.ubuntu.com/ubuntu/ dapper universe 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://th.archive.ubuntu.com/ubuntu/ dapper-backports main restricted univer se multiverse
deb-src http://th.archive.ubuntu.com/ubuntu/ dapper-backports main restricted un iverse multiverse
deb http://security.ubuntu.com/ubuntu dapper-security main restricted
deb-src http://security.ubuntu.com/ubuntu dapper-security main restricted
deb http://security.ubuntu.com/ubuntu dapper-security universe multiverse
deb-src http://security.ubuntu.com/ubuntu dapper-security universe multiverse - use apt-get update : to update list file
- use apt-get dist-upgrade : to upgrade your server to dapper (beware need dist-upgrade not upgrade)
- reboot your system
After this process may check your application, just run fine or not.
