我需要安装 xulrunner 才能使用 Redcar，但我无法这样做。我完全按照这个问题中的步骤操作安装 XULRunner 2.0。
以下是添加 Mozilla PPA 的输出：
lpeabody@ubuntu:/var/www/drupal-7.8$ sudo add-apt-repository ppa:ubuntu-mozilla-daily/ppa
You are about to add the following PPA to your system:
Official PPA for Firefox and Thunderbird daily builds
daily (or even multiple builds per day) for various mozilla projects and branches.
For questions and bugs with software in this archive, please contact <email address hidden> or visit #ubuntu-mozillateam on freenode.
More info: https://launchpad.net/~ubuntu-mozilla-daily/+archive/ppa
Press [ENTER] to continue or ctrl-c to cancel adding it
Executing: gpg --ignore-time-conflict --no-options --no-default-keyring --secret-keyring /tmp/tmp.n2JGd679HN --trustdb-name /etc/apt/trustdb.gpg --keyring /etc/apt/trusted.gpg --primary-keyring /etc/apt/trusted.gpg --keyserver hkp://keyserver.ubuntu.com:80/ --recv B34505EA326FEAEA07E3618DEF4186FE247510BE
gpg: requesting key 247510BE from hkp server keyserver.ubuntu.com
gpg: key 247510BE: "Launchpad PPA for Ubuntu Mozilla Daily Build Team" not changed
gpg: Total number processed: 1
gpg: unchanged: 1
lpeabody@ubuntu:/var/www/drupal-7.8$ sudo apt-get update
Ign http://us.archive.ubuntu.com oneiric InRelease
Ign http://extras.ubuntu.com oneiric InRelease
Ign http://us.archive.ubuntu.com oneiric-updates InRelease
Ign http://us.archive.ubuntu.com oneiric-backports InRelease
Get:1 http://extras.ubuntu.com oneiric Release.gpg [72 B]
Hit http://us.archive.ubuntu.com oneiric Release.gpg
Hit http://extras.ubuntu.com oneiric Release
Hit http://us.archive.ubuntu.com oneiric-updates Release.gpg
Hit http://us.archive.ubuntu.com oneiric-backports Release.gpg
Hit http://extras.ubuntu.com oneiric/main Sources
Hit http://extras.ubuntu.com oneiric/main i386 Packages
Ign http://extras.ubuntu.com oneiric/main TranslationIndex
Hit http://us.archive.ubuntu.com oneiric Release
Hit http://us.archive.ubuntu.com oneiric-updates Release
Hit http://us.archive.ubuntu.com oneiric-backports Release
Ign http://extras.ubuntu.com oneiric/main Translation-en_US
Hit http://us.archive.ubuntu.com oneiric/main Sources
Hit http://us.archive.ubuntu.com oneiric/restricted Sources
Hit http://us.archive.ubuntu.com oneiric/universe Sources
Ign http://extras.ubuntu.com oneiric/main Translation-en
Hit http://us.archive.ubuntu.com oneiric/multiverse Sources
Hit http://us.archive.ubuntu.com oneiric/main i386 Packages
Hit http://us.archive.ubuntu.com oneiric/restricted i386 Packages
Hit http://us.archive.ubuntu.com oneiric/universe i386 Packages
Hit http://us.archive.ubuntu.com oneiric/multiverse i386 Packages
Hit http://us.archive.ubuntu.com oneiric/main TranslationIndex
Hit http://us.archive.ubuntu.com oneiric/multiverse TranslationIndex
Hit http://us.archive.ubuntu.com oneiric/restricted TranslationIndex
Hit http://us.archive.ubuntu.com oneiric/universe TranslationIndex
Hit http://us.archive.ubuntu.com oneiric-updates/main Sources
Hit http://us.archive.ubuntu.com oneiric-updates/restricted Sources
Hit http://us.archive.ubuntu.com oneiric-updates/universe Sources
Hit http://us.archive.ubuntu.com oneiric-updates/multiverse Sources
Hit http://us.archive.ubuntu.com oneiric-updates/main i386 Packages
Hit http://us.archive.ubuntu.com oneiric-updates/restricted i386 Packages
Hit http://us.archive.ubuntu.com oneiric-updates/universe i386 Packages
Hit http://us.archive.ubuntu.com oneiric-updates/multiverse i386 Packages
Hit http://us.archive.ubuntu.com oneiric-updates/main TranslationIndex
Hit http://us.archive.ubuntu.com oneiric-updates/multiverse TranslationIndex
Hit http://us.archive.ubuntu.com oneiric-updates/restricted TranslationIndex
Hit http://us.archive.ubuntu.com oneiric-updates/universe TranslationIndex
Hit http://us.archive.ubuntu.com oneiric-backports/main Sources
Hit http://us.archive.ubuntu.com oneiric-backports/restricted Sources
Hit http://us.archive.ubuntu.com oneiric-backports/universe Sources
Hit http://us.archive.ubuntu.com oneiric-backports/multiverse Sources
Hit http://us.archive.ubuntu.com oneiric-backports/main i386 Packages
Hit http://us.archive.ubuntu.com oneiric-backports/restricted i386 Packages
Hit http://us.archive.ubuntu.com oneiric-backports/universe i386 Packages
Hit http://us.archive.ubuntu.com oneiric-backports/multiverse i386 Packages
Hit http://us.archive.ubuntu.com oneiric-backports/main TranslationIndex
Hit http://us.archive.ubuntu.com oneiric-backports/multiverse TranslationIndex
Hit http://us.archive.ubuntu.com oneiric-backports/restricted TranslationIndex
Hit http://us.archive.ubuntu.com oneiric-backports/universe TranslationIndex
Hit http://us.archive.ubuntu.com oneiric/main Translation-en
Hit http://us.archive.ubuntu.com oneiric/multiverse Translation-en
Hit http://us.archive.ubuntu.com oneiric/restricted Translation-en
Hit http://us.archive.ubuntu.com oneiric/universe Translation-en
Hit http://us.archive.ubuntu.com oneiric-updates/main Translation-en
Hit http://us.archive.ubuntu.com oneiric-updates/multiverse Translation-en
Hit http://us.archive.ubuntu.com oneiric-updates/restricted Translation-en
Hit http://us.archive.ubuntu.com oneiric-updates/universe Translation-en
Hit http://us.archive.ubuntu.com oneiric-backports/main Translation-en
Hit http://us.archive.ubuntu.com oneiric-backports/multiverse Translation-en
Hit http://us.archive.ubuntu.com oneiric-backports/restricted Translation-en
Hit http://us.archive.ubuntu.com oneiric-backports/universe Translation-en
Ign http://security.ubuntu.com oneiric-security InRelease
Ign http://ppa.launchpad.net oneiric InRelease
Ign http://ppa.launchpad.net oneiric InRelease
Hit http://security.ubuntu.com oneiric-security Release.gpg
Hit http://ppa.launchpad.net oneiric Release.gpg
Hit http://security.ubuntu.com oneiric-security Release
Get:2 http://ppa.launchpad.net oneiric Release.gpg [316 B]
Hit http://ppa.launchpad.net oneiric Release
Hit http://security.ubuntu.com oneiric-security/main Sources
Get:3 http://ppa.launchpad.net oneiric Release [9,788 B]
Hit http://security.ubuntu.com oneiric-security/restricted Sources
Hit http://security.ubuntu.com oneiric-security/universe Sources
Hit http://security.ubuntu.com oneiric-security/multiverse Sources
Hit http://security.ubuntu.com oneiric-security/main i386 Packages
Hit http://security.ubuntu.com oneiric-security/restricted i386 Packages
Hit http://security.ubuntu.com oneiric-security/universe i386 Packages
Hit http://security.ubuntu.com oneiric-security/multiverse i386 Packages
Hit http://security.ubuntu.com oneiric-security/main TranslationIndex
Hit http://security.ubuntu.com oneiric-security/multiverse TranslationIndex
Hit http://security.ubuntu.com oneiric-security/restricted TranslationIndex
Hit http://security.ubuntu.com oneiric-security/universe TranslationIndex
Hit http://ppa.launchpad.net oneiric/main Sources
Hit http://ppa.launchpad.net oneiric/main i386 Packages
Ign http://ppa.launchpad.net oneiric/main TranslationIndex
Hit http://security.ubuntu.com oneiric-security/main Translation-en
Get:4 http://ppa.launchpad.net oneiric/main Sources [1,650 B]
Get:5 http://ppa.launchpad.net oneiric/main i386 Packages [12.6 kB]
Hit http://security.ubuntu.com oneiric-security/multiverse Translation-en
Hit http://security.ubuntu.com oneiric-security/restricted Translation-en
Ign http://ppa.launchpad.net oneiric/main TranslationIndex
Hit http://security.ubuntu.com oneiric-security/universe Translation-en
Ign http://ppa.launchpad.net oneiric/main Translation-en_US
Ign http://ppa.launchpad.net oneiric/main Translation-en
Ign http://ppa.launchpad.net oneiric/main Translation-en_US
Ign http://ppa.launchpad.net oneiric/main Translation-en
Fetched 24.5 kB in 5s (4,853 B/s)
Reading package lists... Done
运行更新后，我尝试安装 xulrunner，但返回以下信息：
lpeabody@ubuntu:/var/www/drupal-7.8$ sudo apt-get install xulrunner-2.0 xulrunner-2.0-dev xulrunner-2.0-gnome-support xulrunner-dev
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package xulrunner-2.0-dev 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
Package xulrunner-2.0 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 'xulrunner-2.0' has no installation candidate
E: Package 'xulrunner-2.0-dev' has no installation candidate
E: Unable to locate package xulrunner-2.0-gnome-support
E: Couldn't find any package by regex 'xulrunner-2.0-gnome-support'
E: Unable to locate package xulrunner-dev
如果您需要了解其他任何信息，请具体说明，如果在接下来的 2 个小时内询问我，我会及时回答……也就是美国东部时间凌晨 2 点。
答案1
我确信 Redcar 期望该运行时在某个地方。为什么不手动下载并手动将其放置在正确的位置？这是一个肮脏的伎俩，但它肯定会奏效！
编辑：
对于 Ubuntu 上的 Redcar 安装，我看不到他们限制使用 XULRunner 版本 2 或任何版本的地方。你查看过他们的说明吗？
https://github.com/redcar/redcar/wiki/installation
编辑2
读了几遍之后，我发现 Canonical 似乎从存储库中删除了 XULRunner，由于 PPA 对您不起作用，这里有一个下载 deb 文件的链接。我还没有测试过它们，也不能保证安全。所以请自行承担风险。
http://mirror.pnl.gov/ubuntu//pool/universe/x/xulrunner-2.0/