Could you upload /var/log/arc.log as well as doing:

$ android.sh -c logcat > logcat.log

(Ctrl-C after a few seconds)

and uploading logcat.log

(or maybe 

  $ android.sh -c 'logcat -d' > logcat.log

 so it exits by itself after dumping the log)

Does ARC work okay if you set up the same device/version with a regular user account?

The logs show a couple apps try to install, but some are missing (eg gameloft).

There's an incredible number of these crashes, though they don't look particularly relevant:

10-03 17:20:31.066 13533 13576 E AndroidRuntime: *** FATAL EXCEPTION IN SYSTEM PROCESS: WifiService
10-03 17:20:31.066 13533 13576 E AndroidRuntime: org.chromium.mojo.bindings.SerializationException: Trying to encode a null pointer for a non-nullable type.
10-03 17:20:31.066 13533 13576 E AndroidRuntime: 	at org.chromium.mojo.bindings.Encoder.encodeNullPointer(Encoder.java:510)
10-03 17:20:31.066 13533 13576 E AndroidRuntime: 	at org.chromium.mojo.bindings.Encoder.encode(Encoder.java:242)
10-03 17:20:31.066 13533 13576 E AndroidRuntime: 	at org.chromium.arc.mojom.NetHost_Internal$NetHostSetAlwaysOnVpnParams.encode(NetHost_Internal.java:3258)
10-03 17:20:31.066 13533 13576 E AndroidRuntime: 	at org.chromium.mojo.bindings.Struct.serializeWithHeader(Struct.java:80)
10-03 17:20:31.066 13533 13576 E AndroidRuntime: 	at org.chromium.arc.mojom.NetHost_Internal$Proxy.setAlwaysOnVpn(NetHost_Internal.java:336)
10-03 17:20:31.066 13533 13576 E AndroidRuntime: 	at com.android.server.wifi.WifiProxyServiceImpl.updateAlwaysOnVpn(WifiProxyServiceImpl.java:354)
10-03 17:20:31.066 13533 13576 E AndroidRuntime: 	at com.android.server.wifi.WifiProxyServiceImpl.-wrap6(WifiProxyServiceImpl.java)
10-03 17:20:31.066 13533 13576 E AndroidRuntime: 	at com.android.server.wifi.WifiProxyServiceImpl$AlwaysOnVpnObserver.onChange(WifiProxyServiceImpl.java:341)
10-03 17:20:31.066 13533 13576 E AndroidRuntime: 	at android.database.ContentObserver.onChange(ContentObserver.java:145)
10-03 17:20:31.066 13533 13576 E AndroidRuntime: 	at android.database.ContentObserver$NotificationRunnable.run(ContentObserver.java:216)
10-03 17:20:31.066 13533 13576 E AndroidRuntime: 	at android.os.Handler.handleCallback(Handler.java:751)
10-03 17:20:31.066 13533 13576 E AndroidRuntime: 	at android.os.Handler.dispatchMessage(Handler.java:95)
10-03 17:20:31.066 13533 13576 E AndroidRuntime: 	at android.os.Looper.loop(Looper.java:154)
10-03 17:20:31.066 13533 13576 E AndroidRuntime: 	at android.os.HandlerThread.run(HandlerThread.java:61)

ARC works fine if I sign is as a regular user. Apps that I have installed are auto-installed. I can open play store, download and install new app.

I do not see WifiService exceptions.
   

Deleted: arc_user.log 133 KB

arc_user.log 133 KB View Download

Deleted: logcat_user.log 560 KB

logcat_user.log 560 KB View Download

Crash in #5 - b/117238737

The crash from #8 was fixed.
I verified that it is fixed in 11138.0.0.