obfs4proxy crashes on certain systems.
Tor Browser crazy Sandbox tells me "Can't connect to bridge; PT_MISSING" even when obfs4proxy is installed in my system. Here's some more logs
[notice] Starting with guard context "bridges"
[warn] The communication stream of managed proxy '/home/amnesia/tor/bin/PluggableTransports/obfs4proxy' is 'closed'. Most probably the managed proxy stopped running. This might be a bug of the managed proxy, a bug of Tor, or a misconfiguration. Please enable logging on your managed proxy and check the logs for errors.
[notice] Bootstrapped 5%: Connecting to directory server
[warn] We were supposed to connect to bridge '<manually-redacted>:<manually-redacted>' using pluggable transport 'obfs4', but we can't find a pluggable transport proxy supporting 'obfs4'. This can happen if you haven't provided a ClientTransportPlugin line, or if your pluggable transport proxy stopped running.
[warn] Problem bootstrapping. Stuck at 5%: Connecting to directory server. (Can't connect to bridge; PT_MISSING; count 1; recommendation warn; host <manually-redacted> at <manually-redacted>:<manually-redacted>)
System: Ubuntu 17.10 - AMD64