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etc/apt/sources.list が見つかりません

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etc/apt/sources.list が見つかりません

の source.list を編集してapt-get install update、 から新しいソース コードを生成しようとしましたrepogen.simplylinux.chが、編集中に何が起こったのかわかりませんが、入力するとversion次のように表示されます。

WARNING:root:could not open file '/etc/apt/sources.list'
   version: command not found

そして私がそうするとapt-get install mtoolsこうなります:

root@spider-laptop:~# apt-get install mtools
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Package mtools 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 'mtools' has no installation candidate

答え1

トピックの説明によると、sources.list ファイルが見つからないようです。ファイルが本当に見つからないかどうかを確認してください...

file /etc/apt/sources.list

見つからない場合は、この回答の最後に元のsources.listファイルのコピーを添付しました。(ところで、rootとしてログインしていることに気付きました。管理者ユーザーとしてログインし、必要に応じて権限を昇格する方がよいでしょう)。

ターミナルタイプでは

gksudo gedit /etc/apt/sources.list

この回答の最後に表示されているソースリストの内容を切り取って貼り付けます。geditを閉じて、ターミナルに以下を入力します。

sudo apt-get update

追加した可能性のある他のリポジトリに関しては、提案に従って新しい質問を開いてください。

標準のsources.listファイル（14.04）

#deb cdrom:[Ubuntu 14.04 LTS _Trusty Tahr_ - Release amd64 (20140417)]/ trusty main restricted

# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.
deb http://us.archive.ubuntu.com/ubuntu/ trusty main restricted
deb-src http://us.archive.ubuntu.com/ubuntu/ trusty main restricted

## Major bug fix updates produced after the final release of the
## distribution.
deb http://us.archive.ubuntu.com/ubuntu/ trusty-updates main restricted
deb-src http://us.archive.ubuntu.com/ubuntu/ trusty-updates main restricted

## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
## team. Also, please note that software in universe WILL NOT receive any
## review or updates from the Ubuntu security team.
deb http://us.archive.ubuntu.com/ubuntu/ trusty universe
deb-src http://us.archive.ubuntu.com/ubuntu/ trusty universe
deb http://us.archive.ubuntu.com/ubuntu/ trusty-updates universe
deb-src http://us.archive.ubuntu.com/ubuntu/ trusty-updates universe

## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu 
## team, and may not be under a free licence. Please satisfy yourself as to 
## your rights to use the software. Also, please note that software in 
## multiverse WILL NOT receive any review or updates from the Ubuntu
## security team.
deb http://us.archive.ubuntu.com/ubuntu/ trusty multiverse
deb-src http://us.archive.ubuntu.com/ubuntu/ trusty multiverse
deb http://us.archive.ubuntu.com/ubuntu/ trusty-updates multiverse
deb-src http://us.archive.ubuntu.com/ubuntu/ trusty-updates multiverse

## N.B. software from this repository may not have been tested as
## extensively as that contained in the main release, although it includes
## newer versions of some applications which may provide useful features.
## Also, please note that software in backports WILL NOT receive any review
## or updates from the Ubuntu security team.
deb http://us.archive.ubuntu.com/ubuntu/ trusty-backports main restricted universe multiverse
deb-src http://us.archive.ubuntu.com/ubuntu/ trusty-backports main restricted universe multiverse

deb http://security.ubuntu.com/ubuntu trusty-security main restricted
deb-src http://security.ubuntu.com/ubuntu trusty-security main restricted
deb http://security.ubuntu.com/ubuntu trusty-security universe
deb-src http://security.ubuntu.com/ubuntu trusty-security universe
deb http://security.ubuntu.com/ubuntu trusty-security multiverse
deb-src http://security.ubuntu.com/ubuntu trusty-security multiverse

## Uncomment the following two lines to add software from Canonical's
## 'partner' repository.
## This software is not part of Ubuntu, but is offered by Canonical and the
## respective vendors as a service to Ubuntu users.
# deb http://archive.canonical.com/ubuntu trusty partner
# deb-src http://archive.canonical.com/ubuntu trusty partner

## This software is not part of Ubuntu, but is offered by third-party
## developers who want to ship their latest software.
deb http://extras.ubuntu.com/ubuntu trusty main
deb-src http://extras.ubuntu.com/ubuntu trusty main

代わりにsources.listファイルを生成する

次の URL を介してインタラクティブにリストを生成できます。https://repogen.simplylinux.ch/

答え2

sudo -H leafpad /etc/apt/sources.list

私には効果がある

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