我的电脑安装了 Linux Mint 19.1 Tessa，R 版本为 3.6.3。我正在尝试这样做sudo apt-get update，但遇到了这个错误：
Err:21 https://cloud.r-project.org/bin/linux/ubuntu bionic Release
404 Not Found [IP: 2600:9000:2045:e400:6:c2d3:f940:93a1 443]
E: The repository 'https://cloud.r-project.org/bin/linux/ubuntu bionic Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
另外，我想安装适当的驱动程序，但我也收到此错误：
E:The repository 'https://cloud.r-project.org/bin/linux/ubuntu bionic Release' does not have a Release file.
有人可以帮助我吗？我记得升级 R 时遇到问题，但我不确定 Release 发生了什么。我认为 R 现在工作正常。