Much like Windows 11, without an active connection to the Internet the Windows Subsystem for Linux (WSL) will struggle to complete basic tasks such as updating packages. Exactly why your connection has disappeared could be a number of reasons, but the most important thing is getting it back.
WSL hooks into your Windows PCs network connectivity but can suffer its own issues that can break it while your PC outside the Linux environment is still connected just fine. Fortunately, there's a fairly easy fix you can try that should get you back online.
