Error after fixing java version

gistfile1.txt

kivy@kivy-VirtualBox:~/Repos/kivy/examples/demo/touchtracer$ buildozer android debug
# Check configuration tokens
# Ensure build layout
# Check configuration tokens
# Read available permissions from api-versions.xml
# Preparing build
# Check requirements for android
# Run 'dpkg --version'
# Cwd None
Debian 'dpkg' package management program version 1.19.0.5 (amd64).
This is free software; see the GNU General Public License version 2 or
later for copying conditions. There is NO warranty.
# Search for Git (git)
#  -> found at /usr/bin/git
# Search for Cython (cython)
#  -> found at /usr/local/bin/cython
# Search for Java compiler (javac)
#  -> found at /usr/lib/jvm/java-8-openjdk-amd64/bin/javac
# Search for Java keytool (keytool)
#  -> found at /usr/lib/jvm/java-8-openjdk-amd64/jre/bin/keytool
# Install platform
# Run 'pip install -q --user "appdirs" "colorama>=0.3.3" "sh>=1.10" "jinja2" "six"'
# Cwd None
# Apache ANT found at /home/kivy/.buildozer/android/platform/apache-ant-1.9.4
# Android SDK found at /home/kivy/Android/Sdk
# Android NDK found at /home/kivy/Android/android-ndk-r16b
# Check application requirements
# Check garden requirements
# Compile platform
# Run '/usr/bin/python -m pythonforandroid.toolchain create --dist_name=myapp --bootstrap=sdl2 --requirements=kivy --arch armeabi-v7a --copy-libs --color=always --storage-dir=/home/kivy/Repos/kivy/examples/demo/touchtracer/.buildozer/android/platform/build'
# Cwd /home/kivy/Repos/python-for-android
[INFO]:    Will compile for the following archs: armeabi-v7a
[INFO]:    Found Android API target in $ANDROIDAPI
[INFO]:    Available Android APIs are (27)
[INFO]:    Requested API target 27 is available, continuing.
[INFO]:    Found NDK dir in $ANDROIDNDK
[INFO]:    Got NDK version from $ANDROIDNDKVER
[INFO]:    Using Google NDK r9c
Traceback (most recent call last):
  File "/usr/lib/python2.7/runpy.py", line 174, in _run_module_as_main
    "__main__", fname, loader, pkg_name)
  File "/usr/lib/python2.7/runpy.py", line 72, in _run_code
    exec code in run_globals
  File "/home/kivy/Repos/python-for-android/pythonforandroid/toolchain.py", line 978, in <module>
    main()
  File "/home/kivy/Repos/python-for-android/pythonforandroid/toolchain.py", line 975, in main
    ToolchainCL()
  File "/home/kivy/Repos/python-for-android/pythonforandroid/toolchain.py", line 512, in __init__
    getattr(self, args.subparser_name.replace('-', '_'))(args)
  File "/home/kivy/Repos/python-for-android/pythonforandroid/toolchain.py", line 144, in wrapper_func
    user_ndk_ver=self.ndk_version)
  File "pythonforandroid/build.py", line 342, in prepare_build_environment
    raise IOError('Couldn\'t find a virtualenv executable, '
IOError: Couldn't find a virtualenv executable, you must install this to use p4a.
# Command failed: /usr/bin/python -m pythonforandroid.toolchain create --dist_name=myapp --bootstrap=sdl2 --requirements=kivy --arch armeabi-v7a --copy-libs --color=always --storage-dir=/home/kivy/Repos/kivy/examples/demo/touchtracer/.buildozer/android/platform/build
# 
# Buildozer failed to execute the last command
# The error might be hidden in the log above this error
# Please read the full log, and search for it before
# raising an issue with buildozer itself.
# In case of a bug report, please add a full log with log_level = 2