Follow the ‘verify integrity of game files’ method listed above and restart your computer.

If during the launch, an error occurs, we have to reinstall Steam. Please note that any interruption during the copying process may corrupt the files hence you would have to resort to reinstalling the client again.

It is possible that the Hard Drive that contains the game installation has been corrupted or contains bad sectors.

Navigate to ‘trusted zone’ and add as a trusted application.

Remember to change the settings to Do not restrict application activity as well as Do not scan opened files.

It can also happen if your security software is blocking Steam from saving or downloading any data.

In order to resolve the problem, here are a few fixes you can try.

System info: Processor Information: CPU Vendor: Genuine Intel CPU Brand: Intel(R) Core(TM) i3-4130 CPU @ 3.40GHz CPU Family: 0x6 CPU Model: 0x3c CPU Stepping: 0x3 CPU Type: 0x0 Speed: 3400 Mhz 4 logical processors 2 physical processors Hyper Threading: Supported FCMOV: Supported SSE2: Supported SSE3: Supported SSSE3: Supported SSE4a: Unsupported SSE41: Supported SSE42: Supported AES: Supported AVX: Supported CMPXCHG16B: Supported LAHF/SAHF: Supported Prefetch W: Unsupported Network Information: Network Speed: Operating System Version: Ubuntu 16.04 LTS (64 bit) Kernel Name: Linux Kernel Version: 4.4.0-42-generic X Server Vendor: The X.

This issue is being tracked at Valve Software/steam-for-linux#4670 and/or Valve Software/steam-for-linux#4686.

For that: In some cases, steam requires special permissions to access certain folders and files.