Linux系统安装mono开发环境

1、添加Mono仓库到你的系统
使用以下命令：

Ubuntu 20.04 and later (amd64, armhf, arm64, ppc64el)

sudo apt install ca-certificates gnupg
sudo gpg --homedir /tmp --no-default-keyring --keyring gnupg-ring:/usr/share/keyrings/mono-official-archive-keyring.gpg --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 3FA7E0328081BFF6A14DA29AA6A19B38D3D831EF
sudo chmod +r /usr/share/keyrings/mono-official-archive-keyring.gpg
echo "deb [signed-by=/usr/share/keyrings/mono-official-archive-keyring.gpg] https://download.mono-project.com/repo/ubuntu stable-focal main" | sudo tee /etc/apt/sources.list.d/mono-official-stable.list
sudo apt update

Debian 10 and later (i386, amd64, armhf, arm64, armel, ppc64el)

sudo apt install dirmngr ca-certificates gnupg
sudo gpg --homedir /tmp --no-default-keyring --keyring gnupg-ring:/usr/share/keyrings/mono-official-archive-keyring.gpg --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 3FA7E0328081BFF6A14DA29AA6A19B38D3D831EF
sudo chmod +r /usr/share/keyrings/mono-official-archive-keyring.gpg
echo "deb [signed-by=/usr/share/keyrings/mono-official-archive-keyring.gpg] https://download.mono-project.com/repo/debian stable-buster main" | sudo tee /etc/apt/sources.list.d/mono-official-stable.list
sudo apt update

注意：在Debian 13（Trixie）及更高版本中，系统会为密钥所使用的SHA1算法发出过期警告。您可通过遵循/usr/share/apt/default-sequoia.config中的说明来延长过期日期。

Raspbian 10 and later (armhf)

sudo apt install dirmngr ca-certificates gnupg
sudo gpg --homedir /tmp --no-default-keyring --keyring gnupg-ring:/usr/share/keyrings/mono-official-archive-keyring.gpg --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 3FA7E0328081BFF6A14DA29AA6A19B38D3D831EF
sudo chmod +r /usr/share/keyrings/mono-official-archive-keyring.gpg
echo "deb [signed-by=/usr/share/keyrings/mono-official-archive-keyring.gpg] https://download.mono-project.com/repo/debian stable-raspbianbuster main" | sudo tee /etc/apt/sources.list.d/mono-official-stable.list
sudo apt update

2、 安装Mono

sudo apt install mono-devel

3、验证
为了验证是否安装成功，使用以下命令验证：

lhf@lhf-pc:~$ mono --version
Mono JIT compiler version 6.12.0.200 (tarball Tue Jul 11 21:37:50 UTC 2023)
Copyright (C) 2002-2014 Novell, Inc, Xamarin Inc and Contributors. www.mono-project.com
        TLS:           __thread
        SIGSEGV:       altstack
        Notifications: epoll
        Architecture:  amd64
        Disabled:      none
        Misc:          softdebug 
        Interpreter:   yes
        LLVM:          yes(610)
        Suspend:       hybrid
        GC:            sgen (concurrent by default)

备注
Linux 3.12之前的Mono默认不信任任何SSL证书，因此在访问HTTPS资源时出错。3.12及更高版本不再需要此功能，因为它包含一个在软件包安装时运行的新工具，并将Mono的证书存储与系统证书存储同步（在旧版本上，您必须通过运行mozroots-import--sync来导入Mozilla的受信任证书列表）。某些系统的配置方式使得在安装Mono时不会引入必要的包，在这种情况下，请确保安装了ca证书Mono包。