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unknown error message

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  unknown error message ghe2001 <ghe2001@pm.me> - 2022-02-18 20:40 +0100
    Re: unknown error message David Wright <deblis@lionunicorn.co.uk> - 2022-02-18 21:10 +0100
    Re: unknown error message Greg Wooledge <greg@wooledge.org> - 2022-02-18 21:30 +0100

#245519 — unknown error message

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Does anybody know what:

Error: GDBus.Error:org.freedesktop.systemd1.UnitMasked: Unit -.mount is masked

means?  What is '.mount' and what does 'masked' mean?

I looked on the web and found a discussion involving something called "zynthian."  My log repeats the sentence several times -- from syslog and daemon.

It happens only when I 'apt update' -- I get to all other websites with no trouble (including Debian).  When I ssh to the computers on my LAN in the next room, they both get to the mirrors (one Debian, the other is RaspberryPi).  All my computers are running an updated Buster.

All was working until a few days ago.

The web browser is Firefox-esr.

--
Glenn English


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#245521

On Fri 18 Feb 2022 at 19:17:44 (+0000), ghe2001 wrote:
> Does anybody know what:
> 
> Error: GDBus.Error:org.freedesktop.systemd1.UnitMasked: Unit -.mount is masked
> 
> means?  What is '.mount' and what does 'masked' mean?
> 
> I looked on the web and found a discussion involving something called "zynthian."  My log repeats the sentence several times -- from syslog and daemon.
> 
> It happens only when I 'apt update' -- I get to all other websites with no trouble (including Debian).  When I ssh to the computers on my LAN in the next room, they both get to the mirrors (one Debian, the other is RaspberryPi).  All my computers are running an updated Buster.
> 
> All was working until a few days ago.
> 
> The web browser is Firefox-esr.

man systemctl
man systemd.unit
etc

Cheers,
David.

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#245524

On Fri, Feb 18, 2022 at 07:17:44PM +0000, ghe2001 wrote:
> Does anybody know what:
> 
> Error: GDBus.Error:org.freedesktop.systemd1.UnitMasked: Unit -.mount is masked
> 
> means?  What is '.mount' and what does 'masked' mean?

It's not ".mount".  It's "-.mount".  Specifically, it's a
systemd.mount(5) unit created to represent the root (/) file system.
The / is converted to a - in the unit name.

> I looked on the web and found a discussion involving something called "zynthian."  My log repeats the sentence several times -- from syslog and daemon.

I see this error reported on a pretty regular basis, but there isn't
a single cause for it.  I've heard of *several* different possible
sources.

> It happens only when I 'apt update'

That rings a bell, but I don't remember the precise details.  Are you
a synaptic user, by chance?  It might be a synaptic thing, either because
synaptic is currently running, or because it broke something.

Or... it could be something entirely different.  I believe I've also heard
of this problem being triggered by gparted.  Have you used gparted in
the last few days?

If you can't find an answer with Google, try the standard troubleshooting
steps.  Read the logs, check the status of everything, etc.

systemctl status -- -.mount    would be a good starting point.  Mine
says:

unicorn:~$ systemctl status -- -.mount
● -.mount - Root Mount
     Loaded: loaded (/etc/fstab; generated)
     Active: active (mounted) since Fri 2022-02-04 07:12:29 EST; 2 weeks 0 days>
      Where: /
       What: /dev/sda7
       Docs: man:fstab(5)
             man:systemd-fstab-generator(8)

Warning: some journal files were not opened due to insufficient permissions.

Of course, running it as root would give additional details.

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