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Installation fails on rooted Android v5.0.2, kernel 3.10.54 with "unknown error". Briar versions tested: 1.1, 1.0. Tried both the F-Droid and briar.apk.

Some lines from Logcat output which may be relevant:

D/PackageManager(  665): Renaming /data/app/vmdl103775440.tmp to /data/app/org.briarproject.briar.android-1
I/PackageManager(  665): Start installation for package: null
D/PackageManager(  665): installNewPackageLI: Package{3a782ce1 org.briarproject.briar.android}
D/installd(  161): do_install : org.briarproject.briar.android 10089 10089 default
D/PackageParser(  665): isLcaROM() return false
I/PackageManager(  665): Linking native library dir for /data/app/org.briarproject.briar.android-1
I/PackageManager(  665): Perform pre-dex opt for package: org.briarproject.briar.android
W/mtkdebug(  665): performDexOptLI path : /data/app/org.briarproject.briar.android-1/base.apk
I/art     (  665): DexFile_isDexOptNeeded failed to open oat file '/data/dalvik-cache/arm/data@app@org.briarproject.briar.android-1@base.apk@classes.dex' for file location '/data/app/org.briarproject.briar.android-1/base.apk': Failed to open oat filename for reading: No such file or directory
I/art     (  665): DexFile_isDexOptNeeded failed to open oat file '/data/app/org.briarproject.briar.android-1/arm/base.odex' for file location '/data/app/org.briarproject.briar.android-1/base.apk': Failed to open oat filename for reading: No such file or directory
I/PackageManager(  665): Running dexopt on: /data/app/org.briarproject.briar.android-1/base.apk pkg=org.briarproject.briar.android isa=arm vmSafeMode=false
D/installd(  161): do_dexopt : /data/app/org.briarproject.briar.android-1/base.apk 50089 1 org.briarproject.briar.android arm  0
I/BufferQueueProducer(  146): [com.android.packageinstaller/com.android.packageinstaller.InstallAppProgress](this:0xb87204c8,id:581,api:1,p:18537,c:146) queueBuffer: fps=59.11 dur=1015.09 max=19.31 min=13.48
I/dex2oat (18566): /system/bin/dex2oat --zip-fd=11 --zip-location=/data/app/org.briarproject.briar.android-1/base.apk --oat-fd=12 --oat-location=/data/dalvik-cache/arm/data@app@org.briarproject.briar.android-1@base.apk@classes.dex --instruction-set=arm --instruction-set-features=div --runtime-arg -Xms64m --runtime-arg -Xmx512m
E/installd(  161): DexInv: --- END '/data/app/org.briarproject.briar.android-1/base.apk' --- status=0x000b, process failed
I/PackageManager(  665): Dexopt done on: org.briarproject.briar.android
D/installd(  161): do_remove : org.briarproject.briar.android 0
D/installd(  161): uninstall : org.briarproject.briar.android
W/PackageManager(  665): Package couldn't be installed in /data/app/org.briarproject.briar.android-1
I/PackageManager(  665): Installation done for package: null