*  Detach boot disk from problematic instance
*  Create new instance (on free tier)
*  Attach boot disk to instance
*  ssh in to new instance and mount disk

 ```
 lsblk
 sudo mkdir /vol_1
 ```

 Typically the last entry in lsblk, which is not mounted, will be the attached volume.

 ```
sudo mount /dev/sdf /vol_1
```

* Do whatever on disk.

* Dettach disk
* Attach to original instance as `/dev/sda1`
* Start problematic instance

Note that unless you have attached an elastic IP the public IP will change on restart of the instance.