Curious you describe a setting that doesn't seem to exist:
"Confidentiality, Deactivating lock screen"
Do you mean this? Privacy > Screen lock = OFF
Regardless, please upload your system information using this command:
apport-collect 1724105
** Changed in: gnome-shell (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1724105
Title:
Confidentiality : Deactivating lock screen doesn't work
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