To avoid auto update google chrome version, the simple steps to do are
- Edit the launcher at Ubuntu
sudo vim /usr/share/applications/google-chrome.desktop
And edit every Exec with --simulate-outdated-no-au='Tue, 31 Dec 2099 23:59:59 GMT' --check-for-update-interval=31536000
For example
Exec=/usr/bin/google-chrome-stable --simulate-outdated-no-au='Tue, 31 Dec 2099 23:59:59 GMT' --check-for-update-interval=31536000
2. Disable update on APT and comment it
sudo vim /etc/apt/sources.list.d/google-chrome.list
Done!