This affects me too.
Some googling brought me to this old article and Launchpad bug:
http://ubuntuguide.net/fix-altprint-screen-current-window-screenshot-not-working-in-ubuntu-10-10
https://bugs.launchpad.net/ubuntu/+source/metacity/+bug/642792
Disabling the "Magic SysRq Key" as suggested in the linked article seems to
have fixed the issue for me:
$ sudo sysctl -w kernel.sysrq=0
However Shift+Print Screen to take a screenshot of selected area still
doesn't work at all for me but that may be another bug.
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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to gnome-screenshot in Ubuntu.
https://bugs.launchpad.net/bugs/1072199
Title:
Alt+Print Screen only takes picture of the HUD
Status in Ubuntu Kylin:
Triaged
Status in Unity:
Confirmed
Status in “gnome-screenshot” package in Ubuntu:
Confirmed
Bug description:
According to Ubuntu Desktop Guide (see attached screenshot of the
Ubuntu Desktop Guide) pressing "Alt+Print Screen" should take a
screenshot of a window.
However when I press "Alt+Print Screen" it always takes the screenshot
of the launcher and not of the active window.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntukylin/+bug/1072199/+subscriptions
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