Linux Mint 4.0 Daryna will reach end of life on April 18, 2009. This release was based on Ubuntu 7.10 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 4.0 Daryna are asked to migrate to Linux Mint 5 LTS Elyssa (Long Term Release which will be supported until April 2011) or Linux Mint 6 Felicia (which will be supported until April 2010).
Announcement from Ubuntu: “As with the earlier releases, Ubuntu committed to ongoing security and critical fixes for a period of 18 months. The support period is now nearing its end and Ubuntu 7.10 will reach end of life on Saturday, April 18, 2009. At that time, Ubuntu Security Notices will no longer include information or updated packages for Ubuntu 7.10.”
Note: Linux Mint follows the Ubuntu release cycle with a new release every 6 months, a lifespan of about 1.5 years per release and 3 years per LTS release. LTS stands for Long Term Support. Linux Mint 5 is an LTS release.