Control: forwarded -1 https://trac.torproject.org/projects/tor/ticket/32215
I got the same issue, running buster All windows are black here. start-tor-browser --verbose shows: [21969, Main Thread] WARNING: failed to open shm: Permission denied: file /var/tmp/build/firefox-d051ff6e2f60/ipc/chromium/src/base/shared_memory_posix.cc, line 142 Crash Annotation GraphicsCriticalError: |[0][GFX1-]: Failed to lock new back buffer. (t=0.466201) [GFX1-]: Failed to lock new back buffer. "aa-disable /etc/apparmor.d/torbrowser.Browser.firefox" fixes the issue. "aa-audit /etc/apparmor.d/torbrowser.Browser.firefox" makes syslog show: Oct 23 12:11:23 deimos kernel: [48692.792047] audit: type=1400 audit(1571825483.423:757): apparmor="DENIED" operation="mknod" profile="torbrowser_firefox" name="/dev/shm/org.mozilla.ipc.23967.0" pid=23967 comm="firefox.real" requested_mask="c" denied_mask="c" fsuid=1000 oui Fixed by adding /dev/shm/org.mozilla.*.* rw, to /etc/apparmor.d/torbrowser.Browser.firefox
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