Comment 0 for bug 1633439

This error appears to be 100% reproducible on arm64 builds targetting yakkety (see e.g. https://launchpad.net/~ci-train-ppa-service/+archive/ubuntu/2076/+build/11022370):

dh build-arch --parallel --with translations
   dh_testdir -a -O--parallel
   dh_update_autotools_config -a -O--parallel
   dh_auto_configure -a -O--parallel
 cmake .. -DCMAKE_INSTALL_PREFIX=/usr -DCMAKE_VERBOSE_MAKEFILE=ON -DCMAKE_BUILD_TYPE=None -DCMAKE_INSTALL_SYSCONFDIR=/etc -DCMAKE_INSTALL_LOCALSTATEDIR=/var
-- The C compiler identification is GNU 6.2.0
-- The CXX compiler identification is GNU 6.2.0
-- Check for working C compiler: /usr/bin/aarch64-linux-gnu-gcc
-- Check for working C compiler: /usr/bin/aarch64-linux-gnu-gcc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
-- Check for working CXX compiler: /usr/bin/aarch64-linux-gnu-g++
-- Check for working CXX compiler: /usr/bin/aarch64-linux-gnu-g++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Could NOT find Lcov (missing: LCOV_EXECUTABLE GENHTML_EXECUTABLE)
-- Could NOT find gcovr (missing: GCOVR_EXECUTABLE)
CMake Error at src/Ubuntu/CMakeLists.txt:31 (message):
  Invalid chromium version: ''

It is fixed in the staging branch of webbrowser-app (original bug report: bug #1599695), the fix needs to be backported to yakkety.

[Regression potential]
Low. Need to verify that the chromium version advertised in user agent overrides is still correct.