升级到 20.04 后重启无法启动

Question

升级到 20.04 后重启无法启动。我卡在了 mysql 启动循环中

starting MYSQL Community Server...
[FAILED] Failed to stat MYSQL Communoity Server.
See 'systemctl status mysql.service' for details
[OK] Stopped MYSQL Community Server.
starting MYSQL Community Server...
[FAILED] Failed to stat MYSQL Communoity Server.
See 'systemctl status mysql.service' for details
[OK] Stopped MYSQL Community Server.
...

当我尝试（硬）启动时，我无法让启动菜单使用我的可启动 USB 驱动器。我尝试按住 F2 或 F12 甚至 esc 按钮，但都没有成功。请问我该如何访问启动菜单？

谢谢