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I am trying to change the timezone via UI.

In order to do that I run time-admin from a command line as a regular user. (It is also possible to open the same dialog by right-clicking on the Clock component on the panel, choosing the Properties menu item and then clicking on the Time and Date Settings... button.)

The following message appears in the console output:

Gtk-Message: 15:58:40.008: GtkDialog mapped without a transient parent. This is discouraged.

and the dialog window opens:

Time and Date Settings

When I hover over the Unlock button, the tooltip appears: "Dialog is locked. Click to make changes".

If I click on the Unlock button then nothing happens on the screen, but an additional line appears in the console output:

** (time-admin:8856): WARNING **: 16:10:03.520: Error acquiring permission: Failed to acquire permission for action-id org.freedesktop.systemtoolsbackends.set

What does this message indicate and how to resolve this problem?

There is an exactly same question at Launchpad and a similar question at Ask Ubuntu, but both of them are unanswered.

The strange thing is that when I tried to create a new user and logged in to the system as that new user, the "Authenticate" window poped up for that user once I clicked the Unlock button.

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    It sounds like for some reason you do not the the rights to change the lock status. Did you make a new user other then the one you created during the install and you are logged in as that user and trying to open the lock? If so you need to be logged in as the user you made during the install.
    – David DE
    Commented Mar 28, 2021 at 15:28
  • @David, no, this is the same user that was created during the installation and this is the only user of the system. Moreover, if I try to add a new user via UI (users-admin), the "Add" button has no effect for me as well and there is nothing in the console output.
    – Alexander Pozdneev
    Commented Mar 28, 2021 at 15:56
  • OK then I think that for what ever reason you have a corrupted system. I suggest download a new copy of the ISO. Make a new live media and reinstall from scratch.
    – David DE
    Commented Mar 28, 2021 at 16:26

1 Answer 1

Reset to default
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I had the same situation. It is not a solution but a workaround with commandline:

timedatectl list-timezones

to see the timezones and

timedatectl set-timezone "your/zone"

to set one.

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