**Note** Live Ubuntu images [may require modification](https://github.com/drduh/YubiKey-Guide/issues/116) to `/etc/apt/sources.list` and may need additional packages:
**Optional** Install the `ykman` utility, which will allow you to enable touch policies (requires admin PIN):
```console
sudo apt -y install python3-pip python3-pyscard
pip3 install PyOpenSSL
pip3 install yubikey-manager
sudo service pcscd start
~/.local/bin/ykman openpgp info
```
**Note** Debian does not recommend installing non-Debian packaged Python applications globally. But fortunately, it is not necessary as `yubikey-manager` is available in the stable main repository:
**Warning** Three incorrect *User PIN* entries will cause it to become blocked and must be unblocked with either the *Admin PIN* or *Reset Code*. Three incorrect *Admin PIN* or *Reset Code* entries will destroy data on YubiKey.
@ -1827,8 +1797,6 @@ sudo mount /dev/mapper/gnupg-secrets /mnt/encrypted-storage