私はLinux Mint（シナモン）PCでgnuplotとRustを使ってプロジェクトを進めています。ただし、画像を表示しようとすると、次の結果が表示されます。
called `Result::unwrap()` on an `Err` value: Couldn't spawn gnuplot. Make sure it is installed and available in PATH.
Cause: No such file or directory (os error 2)
まだGnuplotをダウンロードしていないので大丈夫そうです。しかし、一度逃げたら
sudo apt install gnuplot
わかりました。
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
Package gnuplot-x11 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
私は今何をすべきかわかりません。助けてくれてありがとう。ありがとうございます。
編集：私は走った
apt update
そして適切なポリシーを返す
Package files:
100 /var/lib/dpkg/status
release a=now
500 http://packages.microsoft.com/repos/code stable/main armhf Packages
release o=code stable,a=stable,n=stable,l=code stable,c=main,b=armhf
origin packages.microsoft.com
500 http://packages.microsoft.com/repos/code stable/main arm64 Packages
release o=code stable,a=stable,n=stable,l=code stable,c=main,b=arm64
origin packages.microsoft.com
500 http://packages.microsoft.com/repos/code stable/main amd64 Packages
release o=code stable,a=stable,n=stable,l=code stable,c=main,b=amd64
origin packages.microsoft.com
500 http://security.ubuntu.com/ubuntu jammy-security/multiverse i386 Packages
release v=22.04,o=Ubuntu,a=jammy-security,n=jammy,l=Ubuntu,c=multiverse,b=i386
origin security.ubuntu.com
500 http://security.ubuntu.com/ubuntu jammy-security/multiverse amd64 Packages
release v=22.04,o=Ubuntu,a=jammy-security,n=jammy,l=Ubuntu,c=multiverse,b=amd64
origin security.ubuntu.com
500 http://security.ubuntu.com/ubuntu jammy-security/universe i386 Packages
release v=22.04,o=Ubuntu,a=jammy-security,n=jammy,l=Ubuntu,c=universe,b=i386
origin security.ubuntu.com
500 http://security.ubuntu.com/ubuntu jammy-security/universe amd64 Packages
release v=22.04,o=Ubuntu,a=jammy-security,n=jammy,l=Ubuntu,c=universe,b=amd64
origin security.ubuntu.com
500 http://security.ubuntu.com/ubuntu jammy-security/restricted i386 Packages
release v=22.04,o=Ubuntu,a=jammy-security,n=jammy,l=Ubuntu,c=restricted,b=i386
origin security.ubuntu.com
500 http://security.ubuntu.com/ubuntu jammy-security/restricted amd64 Packages
release v=22.04,o=Ubuntu,a=jammy-security,n=jammy,l=Ubuntu,c=restricted,b=amd64
origin security.ubuntu.com
500 http://security.ubuntu.com/ubuntu jammy-security/main i386 Packages
release v=22.04,o=Ubuntu,a=jammy-security,n=jammy,l=Ubuntu,c=main,b=i386
origin security.ubuntu.com
500 http://security.ubuntu.com/ubuntu jammy-security/main amd64 Packages
release v=22.04,o=Ubuntu,a=jammy-security,n=jammy,l=Ubuntu,c=main,b=amd64
origin security.ubuntu.com
500 https://mirror.init7.net/linuxmint vera/backport i386 Packages
release v=21.1,o=linuxmint,a=vera,n=vera,l=linuxmint,c=backport,b=i386
origin mirror.init7.net
500 https://mirror.init7.net/linuxmint vera/backport amd64 Packages
release v=21.1,o=linuxmint,a=vera,n=vera,l=linuxmint,c=backport,b=amd64
origin mirror.init7.net
500 https://mirror.init7.net/linuxmint vera/import i386 Packages
release v=21.1,o=linuxmint,a=vera,n=vera,l=linuxmint,c=import,b=i386
origin mirror.init7.net
500 https://mirror.init7.net/linuxmint vera/import amd64 Packages
release v=21.1,o=linuxmint,a=vera,n=vera,l=linuxmint,c=import,b=amd64
origin mirror.init7.net
700 https://mirror.init7.net/linuxmint vera/upstream i386 Packages
release v=21.1,o=linuxmint,a=vera,n=vera,l=linuxmint,c=upstream,b=i386
origin mirror.init7.net
700 https://mirror.init7.net/linuxmint vera/upstream amd64 Packages
release v=21.1,o=linuxmint,a=vera,n=vera,l=linuxmint,c=upstream,b=amd64
origin mirror.init7.net
500 https://mirror.init7.net/linuxmint vera/main i386 Packages
release v=21.1,o=linuxmint,a=vera,n=vera,l=linuxmint,c=main,b=i386
origin mirror.init7.net
500 https://mirror.init7.net/linuxmint vera/main amd64 Packages
release v=21.1,o=linuxmint,a=vera,n=vera,l=linuxmint,c=main,b=amd64
origin mirror.init7.net
500 https://dl.google.com/linux/chrome/deb stable/main amd64 Packages
release v=1.0,o=Google LLC,a=stable,n=stable,l=Google,c=main,b=amd64
origin dl.google.com
500 https://cli.github.com/packages stable/main amd64 Packages
release o=gh,n=stable,l=gh,c=main,b=amd64
origin cli.github.com
500 http://security.ubuntu.com/ubuntu focal-security/main i386 Packages
release v=20.04,o=Ubuntu,a=focal-security,n=focal,l=Ubuntu,c=main,b=i386
origin security.ubuntu.com
500 http://security.ubuntu.com/ubuntu focal-security/main amd64 Packages
release v=20.04,o=Ubuntu,a=focal-security,n=focal,l=Ubuntu,c=main,b=amd64
origin security.ubuntu.com
500 https://apt.kitware.com/ubuntu focal/main i386 Packages
release o=ubuntu focal,a=focal,n=focal,l=ubuntu focal,c=main,b=i386
origin apt.kitware.com
500 https://apt.kitware.com/ubuntu focal/main amd64 Packages
release o=ubuntu focal,a=focal,n=focal,l=ubuntu focal,c=main,b=amd64
origin apt.kitware.com
500 https://cloud.r-project.org/bin/linux/ubuntu bionic-cran40/ Packages
release v=18.04,o=CRAN,a=bionic-cran40,n=bionic-cran40,l=CRAN,c=
origin cloud.r-project.org
Pinned packages:
snapd -> 2.58+22.04.1 with priority -10
snapd -> 2.58+20.04.1 with priority -10
答え1
リポジトリ設定にパッケージをインストールするために必要なデフォルトのUbuntuリポジトリはありません。以下を含むファイルを探すjammy-security（おそらく）：/etc/apt/sources.list.d/official-package-repositories.list
grep -rl jammy-security /etc/apt/sources.list*
次の行を含めるように編集してください。
deb http://packages.linuxmint.com victoria main upstream import backport
deb http://archive.ubuntu.com/ubuntu jammy main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu jammy-updates main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu jammy-backports main restricted universe multiverse
deb http://security.ubuntu.com/ubuntu/ jammy-security main restricted universe multiverse
その後、アップデートを使用すると、パッケージとその依存関係をsudo apt updateインストールできます。gnuplot