ubuntu22.04 E: Unable to locate package sdl2

对于您的问题，"E: Unable to locate package sdl2"表示在Ubuntu 22.04上找不到sdl2软件包。这可能是因为sdl2软件包不在默认的Ubuntu软件源中。要解决该问题，您可以尝试以下方法：

方法1：
1. 确保您的软件源已更新。可以使用以下命令更新软件源：

   sudo apt update

2. 然后尝试重新安装sdl2软件包：

   sudo apt install sdl2

方法2：
1. 检查您是否已将适当的软件源添加到您的系统。您可以编辑`/etc/apt/sources.list`文件，并确保已添加包含sdl2软件包的软件源。例如，您可以添加以下行：

   deb http://archive.ubuntu.com/ubuntu xenial main universe

2. 更新软件源并尝试重新安装sdl2软件包：

   sudo apt update
   sudo apt install sdl2

如果以上方法都无法解决问题，您还可以尝试从其他来源手动安装sdl2软件包。您可以从sdl2的官方网站或其他可信的软件源下载并安装sdl2软件包。请确保您从可信的来源下载软件包，并按照提供的安装说明进行操作。

: http://stackoverflow.com/questions/11401079/makeinfo-package-missing-in-ubuntu-12-04
: root@Ubuntu32:/home/zhangbin/ffmpeg/ffmpegx86/ffmpeg-1.2# apt-get install texi2html Reading package lists... Done Building dependency tree Reading state information... Done Suggested packages: latex2html The following NEW packages will be installed: texi2html 0 upgraded, 1 newly installed, 0 to remove and 8 not upgraded. Need to get 401 kB of archives. After this operation, 1,851 kB of additional disk space will be used. Get:1 http://us.archive.ubuntu.com/ubuntu/ precise/main texi2html all 1.82-1ubuntu1 [401 kB] Fetched 401 kB in 2s (171 kB/s) Selecting previously unselected package texi2html. (Reading database ... 211335 files and directories currently installed.) Unpacking texi2html (from .../texi2html_1.82-1ubuntu1_all.deb) ... Processing triggers for install-info ... Processing triggers for man-db ... Processing triggers for doc-base ... Processing 1 added doc-base file... Setting up texi2html (1.82-1ubuntu1) ...
: dtc下载地址：git.qemu-project.org/?p=dtc.git;a=snapshot;h=1760e7ca03894689118646e229ca9487158cd0e8;sf=tgz