Impossible to launch Tor Browser 11.5a13 64-bit (English) on Ubuntu

Issue description:
After installation of Tor Browser Alpha, I can’t launch the Tor Browser.

Steps to reproduce
$ xz -d tor-browser-linux64-11.5a13_en-US.tar.xz
$ tar xvf tor-browser-linux64-11.5a13_en-US.tar
$ cd tor-browser_en-US/
$ ./start-tor-browser.desktop


Suggested solution
I saw that my local torrc file is empty. I copy the default file into torrc :
$ cd Browser/TorBrowser/Data/Tor/
$ cp torrc-defaults torrc
Unfortunately, it doesn’t fix the issue.

Content of my torrc file :slight_smile:
$ more Browser/TorBrowser/Data/Tor/torrc

# torrc-defaults for Tor Browser
# This file is distributed with Tor Browser and SHOULD NOT be modified (it
# may be overwritten during the next Tor Browser update). To customize your
# Tor configuration, shut down Tor Browser and edit the torrc file.
# If non-zero, try to write to disk less frequently than we would otherwise.
AvoidDiskWrites 1
# Where to send logging messages.  Format is minSeverity[-maxSeverity]
# (stderr|stdout|syslog|file FILENAME).
Log debug stdout
CookieAuthentication 1
DormantCanceledByStartup 1
## obfs4proxy configuration
ClientTransportPlugin meek_lite,obfs2,obfs3,obfs4,scramblesuit exec ./TorBrowser/Tor/PluggableTransports/obfs4proxy

## snowflake configuration
ClientTransportPlugin snowflake exec ./TorBrowser/Tor/PluggableTransports/snowflake-client -url -front cd -ice,,,,,stun,,,,,,stun:stun.voip,

System configuration

Browser: Tor Browser 11.5a13 64-bit (English)
Hardware: PC DELL XPS 8940
OS: Ubuntu 20.04.4 LTS (64 bits)
Resolution: 1680x1050 (16:10)
Scale level:
Security level:
Installation type: Downloaded from Tor Project

Is there a message in the Shell?

Yes, here is the message in the shell :slight_smile:

Launching './Browser/start-tor-browser --detach'...

I have fixed the issue : Tor browser was already running (11.5 release) and the new Tor browser (11.5a release) cannot bind to Address already in use. Sorry for any convenience.

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