Aha.  The most recent update, yesterday AM, was something to do with 
virtualbox, and I believe the machine was not successfully booted up after 
that.  I'll pursue this angle first.  Ta for the link. /Andrew

Sent from my iPad

> On 28/03/2018, at 1:21 PM, Graham Furniss <[email protected]> 
> wrote:
> 
> This may be un-related, but the symptoms appear similar. 
> 
> Had an issue yesterday with a machine where attempting to log in got a dialog 
> box which began "session only lasted less than 10 seconds 
> /com/ubuntu/upstart:..." . Full error looked something like:
> 
> initctl: Unable to connect to Upstart: Failed to connect to socket 
> /com/ubuntu/upstart: Connection refused
> syndaemon: no process found
> /etc/mdm/Xsession: Beginning session setup...
> localuser:raskolnikov being added to access control list
> 
> Turned out to be virtualbox-guest-x11 which had got installed as part of an 
> update and was stuffing up cinnamon.
> 
> Removed it, forced a re-install of cinnamon and then a reboot and it was all 
> fixed.
> 
> Lots of references on Google such as:
> 
> https://unix.stackexchange.com/questions/346136/linux-mint-18-64-bit-session-failed
> 
> This is interesting as immediately before this, the user had issues with a 
> whole lot of applications not starting, some of them the same as yours.
> 
> Hope this helps.
> 
> Cheers,
> 
> _______________________________________________________________________________
> Graham Furniss                    
> Computer/Electronics Technician
> Department of Chemical and Process Engineering
> College of Engineering
> University of Canterbury
> Phone +64 3 369 3616 or Extn 93616 on campus
> 
> 
> 
> -----Original Message-----
> From: [email protected] 
> [mailto:[email protected]] On Behalf Of 
> [email protected]
> Sent: Wednesday, 28 March 2018 12:56 p.m.
> To: [email protected]
> Subject: [Linux-users] Mint 18: suddenly multiple applications don't launch
> 
> Yesterday on boot up and numerous reboots, Mint 18 Mate confronted me with 
> something I've never seen before.  A few icons had disappeared from the dock 
> (network, update). Multiple applications that I use every day refused to 
> launch. They gave no error messages. Trying to launch from the GUI, the 
> "Starting (name of application) bar would appear on the panel, then after a 
> few seconds, nothing.  Trying to launch from the terminal, nothing, even 
> appending -v or -vv to the command.  I tried running as root via sudo, same 
> result.
> 
> The non functioning applications included Firefox, Chromium, Thunderbird, the 
> network manager when called from Settings, the PDF viewer (whether invoked 
> from the menu or by double-clicking a .pdf document's icon), and Synaptic.
> 
> Applications that seemed to be working normally included the Caja file 
> manager, the display manager, Moneydance, the terminal and, as I then 
> discovered, apt-get.
> 
> With respect to each of the nonfunctioning applications for which I tried 
> apt-get install, apt-get told me it was already installed and at the latest 
> version.
> 
> I was able to install Midori and xpdf, and they both worked.  When I then 
> tried removing and reinstalling Thunderbird, though, it did remove and 
> reinstall but it still wouldn't launch.  Thunderbird's data files seem mostly 
> OK, although one or two of the mail sub folders may be duplicated.
> 
> I have a quite up to date backup of my home folder, so if I have to reinstall 
> the OS it's a nuisance rather than a tragedy, but is there any other way 
> forward anyone can recommend?
> 
> TIA - Andrew
> 
> Sent from my iPad
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