When I use PX2 to install some softwares, however, the fault informations return back. Our company’s network need autorrations.
GPG error: http://cn.archive.ubuntu.com trusty InRelease: Clearsigned file isn’t valid, got ‘NODATA’ (does the network require authentication).
And in the Ubuntu, I did not see the network sign. So I need to reinstall the OS. However, I did not get the way to step into the BIOS.