After I ran the command sudo apt-get upgrade, fonts in chrome became very small. On pages everything is OK. But tab names, the bookmark bar, right click menu, autofill in forms are too small even to read. System settings are OK, only Chrome has this issue.
I have Ubuntu 16.04 LTS
Go to your Settings -> Displays
Note what the value of the slider is at "Scale for menu and title bars" (mine was 1.5)
Open a terminal
sudo -H gedit /usr/share/applications/google-chrome.desktop
Find this line:
Exec=/usr/bin/google-chrome-stable %U
Change it to this (where n is the value you noted in step #2):
Exec=/usr/bin/google-chrome-stable --force-device-scale-factor=n %U
Save/close, relaunch Chrome.
Explanation: Ubuntu applies a system-wide scaling factor to the UI in
hi-DPI monitors. Chrome thinks it's so special, so it ignores that and
does its own thing.
From this answer by Brandon to this question on SuperUser
Chrome UI size & zoom levels in Ubuntu 16.04
