How to install backup of steam games on Ubuntu

Solution 1:

You need the manifest of the app. The data is there but it is not "listed" in the library due to that. Manifests basically tell Steam what the app is called, what its id is, where is the source located, and default presets. Manifests are located in SteamApps and are called appmanifest_<number>.acf (<number> indicates the app number without < and >).

You can create a simple manifest by launching a text editor and formatting it like this:

"AppState"
{
  "AppID"  "49520"
  "Universe" "1"
  "StateFlags" "1026"
  "installdir"      "Borderlands 2"
}

49520 is the application ID for Borderlands 2. installdir points to the name of the directory in SteamApps/common where the data is located. Save the manifest with the number in the name being the same as App ID. In this case you would save it as: appmanifest_49520.acf