从Debian v9.5的Mono v4.6.2（驱动器中有Debian安装CD）
在为Debian 9添加了正确的存储库之后（按照https://www.mono-project.com/download/stable/#download-lin-debian上的说明进行操作）：
apt update
Ign:1 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official amd64 xfce-CD Binary-1 20180714-10:25] stretch InRelease
Err:2 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official amd64 xfce-CD Binary-1 20180714-10:25] stretch Release
Please use apt-cdrom to make this CD-ROM recognized by APT. apt-get update can not be used to add new CD-ROMs
Ign:3 http://ftp.us.debian.org/debian stretch InRelease
Hit:4 http://security.debian.org/debian-security stretch/updates InRelease
Hit:5 http://ftp.us.debian.org/debian stretch-updates InRelease
Hit:6 http://ftp.us.debian.org/debian stretch Release
Hit:7 http://linux.teamviewer.com/deb stable InRelease
Hit:9 http://linux.teamviewer.com/deb preview InRelease
Hit:10 https://download.mono-project.com/repo/debian stable-stretch InRelease
Ign:8 http://cdn-fastly.deb.debian.org/debian jessie InRelease
Hit:11 http://cdn-fastly.deb.debian.org/debian jessie Release
Reading package lists... Done
E: The repository 'cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official amd64 xfce-CD Binary-1 20180714-10:25] stretch Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
我尝试过：
apt-cdrom add
Using CD-ROM mount point /media/cdrom/
Unmounting CD-ROM...
Waiting for disc...
Please insert a Disc in the drive and press [Enter]
Mounting CD-ROM...
Identifying... [411e6cc38c8dd1371217e68c34e1ecd0-2]
Scanning disc for index files...
Found 1 package indexes, 0 source indexes, 1 translation indexes and 0 signaturs
This disc is called:
'Debian GNU/Linux 9.5.0 _Stretch_ - Official amd64 xfce-CD Binary-1 20180714-10:25'
Reading Package Indexes... Done
Reading Translation Indexes... Done
Writing new source list
Source list entries for this disc are:
deb cdrom:[Debian GNU/Linux 9.5.0 _Stretch_ - Official amd64 xfce-CD Binary-1 20180714-10:25]/ stretch main
Unmounting CD-ROM...
Repeat this process for the rest of the CDs in your set.
但是 apt update 我仍然遇到相同的错误。
确定，从驱动器中弹出CD（根据Lex Li）。同时，我发现我需要将我的repo包固定到v5.0.1，因此将更新说明修改为以下内容：
echo "deb download.mono-project.com/repo/debian stable-stretch/snapshots/5.0.1 main" | sudo tee /etc/apt/sources.list.d/mono-official-stable.list
然后重新运行 apt update
但是正在获得以下输出：
Ign:1 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official amd64 xfce-CD Binary-1 20180714-10:25] stretch InRelease
Err:2 cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official amd64 xfce-CD Binary-1 20180714-10:25] stretch Release
Please use apt-cdrom to make this CD-ROM recognized by APT. apt-get update cannot be used to add new CD-ROMs
Hit:3 http://security.debian.org/debian-security stretch/updates InRelease
Ign:4 http://ftp.us.debian.org/debian stretch InRelease
Hit:5 http://ftp.us.debian.org/debian stretch-updates InRelease
Hit:6 http://linux.teamviewer.com/deb stable InRelease
Hit:7 http://linux.teamviewer.com/deb preview InRelease
Hit:9 http://ftp.us.debian.org/debian stretch Release
Ign:8 http://cdn-fastly.deb.debian.org/debian jessie InRelease
Hit:10 http://cdn-fastly.deb.debian.org/debian jessie Release
Ign:11 https://download.mono-project.com/repo/debian stable-stretch/snapshots/5.0.1 InRelease
Err:12 https://download.mono-project.com/repo/debian stable-stretch/snapshots/5.0.1 Release
404 Not Found
Reading package lists... Done
E: The repository 'cdrom://[Debian GNU/Linux 9.5.0 _Stretch_ - Official amd64 xfce-CD Binary-1 20180714-10:25] stretch Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
E: The repository 'https://download.mono-project.com/repo/debian stable-stretch/snapshots/5.0.1 Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.