Ignore package in update manager

Then you need to do an apt-pinning, to prevent future updates:

Create a new file in /etc/apt/preferences.d/ (if Ubuntu >= 10.4) named after your program, with following entry:

Package: program
Pin: version 1.2.3*
Pin-Priority: 1000

assuming, you know that your programs version, you want to freeze, is 1.2.3


1 - Go to Synaptic Package Manager

2 - Enter [package name] into the search field

3 - Highlight the installed package

4 - Click on Package on the top row

5 - Select Lock Version

Done, now [package name] will no longer be updated.