Ubuntu shortcuts not working when Chrome text fields are highlighted

Had the same problem. What worked for me was that I changed the order of language input on my system. Make sure your default language (the one you use the most) is the first on the 'Region & Languages' input sources tab. That would make your shortcuts work when using the first language, but not the second.

Hope this helps.

I also have same problem in ubuntu-mate 18.10 and google chrome 71

the problem is probably because there is no required library/package for the ibus to work in google chrome

installing these package fix the problem in my computer

sudo apt install ibus ibus-gtk ibus-gtk3 ibus-qt4

The update to Chrome 72 today solved the issue.

Related bug on the chromium bug tracker: https://bugs.chromium.org/p/chromium/issues/detail?id=899881

Related fixing commit: https://chromium.googlesource.com/chromium/src.git/+/faa579def265753007f87c3ea85a907f0ed469b0