I have three Linux systems all Ubuntu based and two of them are using Firefox 35 (Xfce Linux Mint Qiana and Ubuntu Unity 14.04) while the third, Kubuntu 15.04 development branch (with the new Plasma 5) has Firefox 34. When I try to follow the normal method to update Firefox to the latest version the program acts as if no update is available. The system also shows the notice "up to date".
In Synaptic there is no option to upgrade Firefox. (I will not mention Muon here, if has big problems in this unstable version.)
Going to https://www.mozilla.org/en-US/plugincheck/ I see the message "Looks like you’re using an older version of Firefox." and I get to download
firefox-35.0.1.tar.bz2. But I do not want to use the archived/portable version.
How to get to the latest version as usual?