lp:ubuntu-keyboard, tests expects writeable $HOME

See the manual page for dbus-uuidgen to correct this issue.
********* Start testing of TestRepeatBackspace *********
Config: Using QTest library 5.0.2, Qt 5.0.2
PASS : TestRepeatBackspace::initTestCase()
error: empty dic file
Hash Manager Error : 2
[DatabaseConnector] Unable to open database: /sbuild-nonexistent/.presage/lm.db
[PredictorRegistry] unable to open database file
[PredictorRegistry] Predictor UserSmoothedNgramPredictor failed to initialize.
[PredictorRegistry] Unable to initialize predictor: UserSmoothedNgramPredictor
FAIL! : TestRepeatBackspace::testClick() Caught unhandled exception
   Loc: [qtestcase.cpp(2142)]
Totals: 1 passed, 1 failed, 0 skipped
********* Finished testing of TestRepeatBackspace *********
terminate called after throwing an instance of 'PredictorRegistry::PredictorRegistryException'
  what(): Unable to initialize predictor: UserSmoothedNgramPredictor

When building with "trusty & trusty-proposed" enabled against ubuntu archive. Do I need additional external dependencies or PPA to build lp:ubuntu-keyboard trunk?