如何在Ubuntu20.04上安装lubicu66？

我正在尝试在 Ubuntu 20.04 上安装 Ezra-project。当我运行安装它失败并说：

dpkg: dependency problems prevent configuration of ezra-project:
 ezra-project depends on libicu66; however:
  Package libicu66 is not installed.

我尝试安装 libicu66

    sudo apt install libicu66

但它说

Package libicu66 is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source

E: Package 'libicu66' has no installation candidate

libicu66 是否可用于 Ubuntu 20.04？如果是这样，请有人指导我从哪里下载它？

回答