I updated google chrome from the software updates in ubuntu 12.04 , but it didn't actually update . The "about google chrome " is still showing the previous release .
If you would like to keep you browser up to date, I think the easiest thing to do is to add the PPA. I will explain how to do this for both Chrome and Chromium. These two browsers are mostly the same, but you can check out the differences here.
First you have to install the key. This can be done by opening Terminal and typing
Step two is to add the repository
Then you update and, if you haven't already, install Google Chrome
Chromium is more straight forward. Just add the PPA, update, and install by typing this in Terminal:
Download the latest deb.
Install it.It will add repository to your software source. After that you can update it via terminal when a update pack release. via comand
I had the same problem for Ubuntu 14 (end of 2015!): Chrome refused to update although all the required updates were done. The reason seems to be that there's still some background processes running even though Chrome is closed.
Close Chrome and just look up all "chrome" entries in 'top' and do 'kill 12345' where 12345 is the PID of each 'chrome' process. Then start the browser.