Try apt update

Author: swaroopch

.github/workflows/main.yml

@@ -17,7 +17,9 @@ jobs:
     steps:
 
       - name: Install Calibre
-        run: sudo apt install calibre  # for `ebook-convert` command
+        run: |
+          sudo apt update
+          sudo apt install calibre  # for `ebook-convert` command
 
       # https://github.com/actions/setup-node
       - name: Install Node.js