After Ubuntu crash, can't open Audacity as "already running"

While converting some audio in Audacity, I moved by accident the file Audacity that was exporting.

As the file was still being exported, the system crashed.

After reboot, if I try to open Audacity,its dialog window goes like there was already am open session of Audacity:

The system has detected that another copy of Audacity is running.
Running two copies of Audacity simultaneously may cause
data loss or cause your system to crash.

Use the New or Open commands in the currently running Audacity
process to open multiple projects simultaneously.

Of course, I can't see any open Audacity.

Is there a way to kill an "invisible" session of Audacity, or maybe is there any system file to analyse as the software process is not active in system monitor?

Ubuntu 16.04

Solution 1:

Try this:

Open a terminal,

Press Ctrl+Alt+T

Run it:

exec sudo -i
rm -f /var/tmp/audacity-$USER/audacity-lock-$USER

And try to open Audacity.