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Ubuntu 18.04 では mono をインストールできません

tag-icon • tag-icon 18.04 apt mono
Ubuntu 18.04 では mono をインストールできません

(私が見つけた類似した質問を調べて、重複していないことを確認しました。

エラーメッセージ：

Err:1 https://download.mono-project.com/repo/ubuntu stable-bionic/main amd64 libmono-corlib4.5-cil all 6.12.0.122-0xamarin1+ubuntu1804b1
  504  Gateway Timeout [IP: 117.18.232.200 443]
Get:2 https://download.mono-project.com/repo/ubuntu stable-bionic/main amd64 libmono-system-servicemodel-routing4.0-cil all 6.12.0.122-0xamarin1+ubuntu1804b1 [41.6 kB]
Fetched 41.6 kB in 16s (2,555 B/s)                                    
E: Failed to fetch https://download.mono-project.com/repo/ubuntu/pool/main/m/mono/libmono-corlib4.5-cil_6.12.0.122-0xamarin1+ubuntu1804b1_all.deb  504  Gateway Timeout [IP: 117.18.232.200 443]
E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?

以下の操作を試みましたが、いずれも機能しません。

  1. apt-get update
  2. モノのダウンロードに従う説明書Ubuntu 18.04の場合:
    1. sudo apt install gnupg ca-certificates
    2. sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 3FA7E0328081BFF6A14DA29AA6A19B38D3D831EF
    3. `echo "debhttps://download.mono-project.com/repo/ubuntustable-bionic main" | sudo tee /etc/apt/sources.list.d/mono-official-stable.list
    4. インデックスを更新
  3. で再度インストールしてくださいfix-missing。

OS情報:

> uname -a
Linux **** 5.4.0-87-generic #98~18.04.1-Ubuntu SMP Wed Sep 22 10:45:04 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux

EIDT: URL からタイムアウト deb パッケージを直接取得できますが、インストール時に次のように表示されます:

dpkg: dependency problems prevent configuration of libmono-system-servicemodel-routing4.0-cil:
 libmono-system-servicemodel-routing4.0-cil depends on libmono-corlib4.5-cil (>= 4.0.0~alpha1); however:
  Package libmono-corlib4.5-cil is not installed.
 libmono-system-servicemodel-routing4.0-cil depends on libmono-system-configuration4.0-cil (>= 4.0.0~alpha1); however:
  Package libmono-system-configuration4.0-cil is not installed.
 libmono-system-servicemodel-routing4.0-cil depends on libmono-system-runtime-serialization4.0-cil (>= 4.0.0~alpha1); however:
  Package libmono-system-runtime-serialization4.0-cil is not installed.
 libmono-system-servicemodel-routing4.0-cil depends on libmono-system-servicemodel4.0a-cil (>= 3.2.3); however:
  Package libmono-system-servicemodel4.0a-cil is not installed.
 libmono-system-servicemodel-routing4.0-cil depends on libmono-system4.0-cil (>= 4.0.0~alpha1); however:
  Package libmono-system4.0-cil is not installed.

dpkg: error processing package libmono-system-servicemodel-routing4.0-cil (--install):
 dependency problems - leaving unconfigured
Errors were encountered while processing:
 libmono-system-servicemodel-routing4.0-cil

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