mrmulti

You can download the older deb
 
http://launchpadlibrarian.net/319181475/chromium-browser_58.0.3029.110-0ubuntu0.14.04.1176_armhf.deb
 
But it also requires the exact chromium-codecs-ffmpeg-extra package
 
I did somehting along the lines of this...
sudo apt remove chromium-browser mkdir tempforinstall cd tempforinstall wget http://launchpadlibrarian.net/319181475/chromium-browser_58.0.3029.110-0ubuntu0.14.04.1176_armhf.deb wget http://launchpadlibrarian.net/319181477/chromium-codecs-ffmpeg-extra_58.0.3029.110-0ubuntu0.14.04.1176_armhf.deb sudo dpkg -i *.deb sudo -s echo chromium-browser hold | dpkg --set-selections This removes the 59 version, downloads 58 versions, installs them and then locks the browser so it doesn't get upgraded. I'm sure someone could do this in less lines but it worked for me.
 
I don't get the Lock option in synaptic for some reason.
 

Finding an answer by your self and share this is always a good oppurtunity. 

ok I'll answer my own question since i figured it out.  Start terminal emulator, type su and enter the superuser password.  then type passwd <user> and enter the user password. voila

ok I'll answer my own question since i figured it out.  Start terminal emulator, type su and enter the superuser password.  then type passwd <user> and enter the user password. voila