Lighting build stuck at 0%

Help! when I press build UE4 freezez at 0% when building lighting. It doesn’t freeze my computer at all, and I can move around in the viewport. I thought it was because I was offline but this person says that is not my problem Build Lighting Offline? - Rendering - Epic Developer Community Forums
and I did eveything I could. :frowning: as a test I hooked up again and now it won’t build at all! And it has built before in the past. Help would be appreciated. Here are my pc specs.

Os. Unbuntu 4.04.10 or whatever. 64bit.

Memory. 8GB

Video card. GeForce GTX 550 Ti/PCIe/SSE2

Processor. AMD FX-4100 Quad-Core Processor × 4

Closing as duplicate of: [Linux] Cannot build lighting! - Platform & Builds - Epic Developer Community Forums