Hi Hans,

On Fri, Aug 14, 2020 at 09:56:53AM +0200, Hans-Christoph Steiner wrote:
> (node:8) [DEP0005] DeprecationWarning: Buffer() is deprecated due to security 
> and usability issues. Please use the Buffer.alloc(), Buffer.allocUnsafe(), or 
> Buffer.from() methods instead.
> 
> (element-desktop:8): dconf-WARNING **: 09:51:34.251: Unable to open 
> /var/lib/flatpak/exports/share/dconf/profile/user: Permission denied
> Starting auto update with base URL: https://packages.riot.im/desktop/update/
> Auto update not supported on this platform
> [50:0814/095134.384213:FATAL:platform_shared_memory_region_posix.cc(254)] 
> This is frequently caused by incorrect permissions on /dev/shm.  Try 'sudo 
> chmod 1777 /dev/shm' to fix.

The error message looked a bit different for me:

> (node:12) [DEP0005] DeprecationWarning: Buffer() is deprecated due to 
> security and usability issues. Please use the Buffer.alloc(), 
> Buffer.allocUnsafe(), or Buffer.from() methods instead.
> Starting auto update with base URL: https://packages.riot.im/desktop/update/
> Auto update not supported on this platform
> 
> (element-desktop:12): libappindicator-WARNING **: 10:20:24.734: Unable to get 
> the session bus: Could not connect: No such file or directory
> 
> (element-desktop:12): LIBDBUSMENU-GLIB-WARNING **: 10:20:24.734: Unable to 
> get session bus: Could not connect: No such file or directory
> [66:0814/102024.817688:FATAL:platform_shared_memory_region_posix.cc(254)] 
> This is frequently caused by incorrect permissions on /dev/shm.  Try 'sudo 
> chmod 1777 /dev/shm' to fix.

It turned out that "nodbus" from electron.profile (which gets included) was the 
problem.
So I added "ignore nodbus" to element-desktop.profile and it was starting.
Does this also work for you?

Regards,
  Reiner

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