1. Check Permissions: On Linux, hardware wallets sometimes require additional permissions. You may need to add a Udev rule for the Ledger device. Details on how to do this are available on Ledger's official support page.

2. Update Software and Firmware: Ensure that both Sparrow Wallet and your Ledger device are running the latest versions of their respective software and firmware. Outdated versions may cause compatibility issues.

3. Debug Connection: You can run Sparrow Wallet from the command line with debugging enabled to get more detailed error messages, which may help in identifying the problem.

4. Try a Different Cable or Port: Sometimes the connection issues are related to physical connections, such as a faulty cable or USB port. Try using a different cable or connecting to a different USB port.