[skip ci] ubuntu1604

Author: rusty1s

.github/workflows/building.yml

@@ -10,7 +10,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-18.04, macos-10.15, windows-latest]
+        os: [ubuntu-16.04, macos-10.15, windows-latest]
         python-version: [3.6, 3.7, 3.8, 3.9]
         torch-version: [1.8.0, 1.9.0]
         cuda-version: ['cpu', 'cu101', 'cu102', 'cu111']

.github/workflows/linting.yml

@@ -9,7 +9,7 @@ jobs:
 
     strategy:
       matrix:
-        os: [ubuntu-latest]
+        os: [ubuntu-16.04]
         python-version: [3.6]
 
     steps:

.github/workflows/testing.yml

@@ -9,7 +9,7 @@ jobs:
 
     strategy:
       matrix:
-        os: [ubuntu-latest, windows-latest]
+        os: [ubuntu-16.04, windows-latest]
         python-version: [3.6]
         torch-version: [1.8.0, 1.9.0]