Linux Mint 6 Felicia will reach end of life on April 30, 2010. This release was based on Ubuntu 8.10 which is planned to reach end-of-life at the same date.
Repositories will remain open for another while but no more updates or security fixes will be made available. Users of Linux Mint 6 Felicia are asked to migrate to Linux Mint 8 Helena (which will be supported until April 2011) or to wait for the upcoming Linux Mint 9 LTS Isadora (Long Term Release which will be released in the end of May and supported until April 2013).
Read more at Linux Mint