我尝试在 Ubuntu 上安装虚拟机，但现在我无法从终端执行许多操作

Question

E: Conflicting values set for option Signed-By regarding source https://download.virtualbox.org/virtualbox/debian/ focal: /usr/share/keyrings/oracle-virtualbox-2016.gpg != 
E: The list of sources could not be read.
E: Conflicting values set for option Signed-By regarding source https://download.virtualbox.org/virtualbox/debian/ focal: /usr/share/keyrings/oracle-virtualbox-2016.gpg != 
E: The list of sources could not be read.