我正在尝试执行此代码：
sudo apt-get install g++ build-essential autoconf automake automake1.9 cmake doxygen bison flex libncurses5-dev libsdl1.2-dev libreadline-dev libusb-dev texinfo libgmp3-dev libmpfr-dev libelf-dev libmpc-dev libfreetype6-dev zlib1g-dev libtool libtool-bin subversion git tcl unzip
但是我遇到了这个问题：
Package automake 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 'automake' has no installation candidate
E: Unable to locate package automake1.9
E: Couldn't find any package by glob 'automake1.9'
E: Couldn't find any package by regex 'automake1.9'
E: Unable to locate package doxygen
E: Unable to locate package libsdl1.2-dev
E: Couldn't find any package by glob 'libsdl1.2-dev'
E: Couldn't find any package by regex 'libsdl1.2-dev'
E: Unable to locate package libgmp3-dev
E: Unable to locate package libmpfr-dev
E: Unable to locate package libelf-dev
E: Unable to locate package libmpc-dev
E: Unable to locate package libtool-bin
我尝试使用sudo apt-get update，但仍然出现此错误！有什么想法吗？
的输出grep "^deb" /etc/apt/sources.list为：
deb http://old-releases.ubuntu.com/ubuntu/ xenial main restricted multiverse
deb http://old-releases.ubuntu.com/ubuntu/ xenial-updates main restricted multiverse
deb http://old-releases.ubuntu.com/ubuntu/ xenial universe
deb http://old-releases.ubuntu.com/ubuntu/ xenial-updates universe
deb http://old-releases.ubuntu.com/ubuntu/ xenial-backports main restricted universe multiverse
deb http://old-releases.ubuntu.com/ubuntu trusty-security main restricted multiverse
deb http://old-releases.ubuntu.com/ubuntu trusty-security universe
deb http://archive.panda3d.org/ubuntu xenial main
deb-src http://archive.panda3d.org/ubuntu xenial main
deb http://archive.canonical.com/ xenial partner
deb http://archive.ubuntu.com/ubuntu xenial universe main restricted multiverse
答案1
尝试更新源列表：
Ubuntu 主要存储库
德布http://fr.archive.ubuntu.com/ubuntu/xenial 主受限宇宙多元宇宙
deb-源文件http://fr.archive.ubuntu.com/ubuntu/xenial 主受限宇宙多元宇宙