Knowledge base for software setup, errors, and daily tool work.

Windows Security for Ubuntu Installation Checklist

Before You Install Ubuntu

If you're dual-booting Windows and Ubuntu, or replacing Windows...

Fix Windows Defender Antivirus Permission Denied Error

You try to start Windows Defender Antivirus and get a “permission denied” error. This typically h...

Fix Microsoft Store DNS Error with Command Prompt

If you see errors like "Check your connection" or "Try that again – Something went wrong" in Micr...

Fix Putty Connection Refused on Port 22

You try to connect to a remote server with Putty on port 22, but you get 'Connection refused'. Th...

Fix Windows Activation Error After Hardware Change

You've just swapped out your motherboard, CPU, or other major hardware, and now Windows shows an ...

Fix Ubuntu apt update GPG error: repository not signed

When running sudo apt update, you might see an error like: