You haven't booted into Ubuntu for three months. You now need a critical SSH key stored in /home/user/.ssh/id_rsa . Instead of rebooting (which takes 5 minutes), you launch Linux Reader Portable from your desktop and copy the key in 30 seconds.
When searching for the right tool, ensure it supports the following features: linux reader portable
Understanding the utility of this software is easier when visualizing specific scenarios: You haven't booted into Ubuntu for three months