Under "Screensaver" make sure you have the "Lock screen after" setting
set to 0.
Confirmed works as you describe with command:
> xscreensaver-command -activate
I've noticed various power management tools interfere with the
xscreensaver default xlock. This could be why you're experiencing
difficulty.
> xscreensaver-command -version
XScreenSaver 5.30
** Changed in: xscreensaver (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1494454
Title:
Lock screen on wakeup from screensaver - feature request
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