deadsnake python uses systemwide pip

Author: jiridanek

.travis.yml

@@ -124,6 +124,7 @@ jobs:
     before_install:
       - sudo apt-get install clang-11 llvm-11-dev
       # Python 3.8.2 in Ubuntu LTS has ASan issues
+      - sudo apt install -y python3-pip
       - sudo add-apt-repository -y ppa:deadsnakes/ppa
       - sudo apt-get update
       - sudo apt-get install python3.9 python3.9-dev python3.9-distutils