我正在运行 Ubuntu 17.04，“zesty”。
我需要安装 Google Protocol Buffer 8 版本。
我可以在https://packages.ubuntu.com/trusty/amd64/libprotobuf8/download
说明书指出 aptitude 是下载和安装该软件包的首选方式。
我在末尾添加了以下行/etc/apt/sources.list：
deb http://mirrors.kernel.org/ubuntu/pool/main/p/protobuf trusty main
然后我运行 aptitude：
$ sudo aptitude install libprotobuf8=libprotobuf8_2.5.0-9ubuntu1_amd64.deb
Unable to find a version "libprotobuf8_2.5.0-9ubuntu1_amd64.deb" for the package "libprotobuf8"
Unable to apply some actions, aborting
$ sudo aptitude install libprotobuf8=2.5.0-9ubuntu1
No packages will be installed, upgraded, or removed.
0 packages upgraded, 0 newly installed, 0 to remove and 6 not upgraded.
Need to get 0 B of archives. After unpacking 0 B will be used.
使用 apt-get 也不起作用：
$ sudo apt-get install libprotobuf8=2.5.0-9ubuntu1
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Can't find a source to download version '2.5.0-9ubuntu1' of 'libprotobuf8:amd64'
当我跑步时sudo apt-get update
我懂了
...
Err:3 http://mirrors.kernel.org/ubuntu/pool/main/p/protobuf trusty/main amd64 Packages
404 Not Found
...
W: The repository 'http://mirrors.kernel.org/ubuntu/pool/main/p/protobuf trusty Release' does not have a Release file.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
E: Failed to fetch http://mirrors.kernel.org/ubuntu/pool/main/p/protobuf/dists/trusty/main/binary-amd64/Packages 404 Not Found
E: Some index files failed to download. They have been ignored, or old ones used instead.
尽管如此，/var/lib/dpkg/status显示：
Package: libprotobuf8
Status: install ok config-files
Section: libs
Installed-Size: 1083
Architecture: amd64
Multi-Arch: same
Source: protobuf
Version: 2.5.0-9ubuntu1
Config-Version: 2.5.0-9ubuntu1
Depends: libc6 (>= 2.14), libgcc1 (>= 1:4.1.1), libstdc++6 (>= 4.3), zlib1g (>= 1:1.1.4)
This package contains the runtime library needed for C++ applications.
Homepage: https://code.google.com/p/protobuf/
Original-Maintainer: Robert S. Edmonds <[email protected]>
但是我在系统上的任何地方都找不到 libprotobuf.so.8。
我究竟做错了什么？
答案1
无法使用建议的答案进行安装，因此从以下位置下载了文件http://mirrors.kernel.org/ubuntu/pool/main/p/protobuf
和
sudo apt install ./libprotobuf8_2.5.0-9ubuntu1_amd64.deb
答案2
libprotobuf8 已在 ubuntu 存储库中，您只需使用包管理器 apt-get 或 aptitude 即可轻松安装它。例如：
sudo apt-get install libprotobuf8你添加的那个源基本上是无用的或不需要的，我会将其删除
指定软件包版本时，只需使用版本，而不是名称，当然也不是 .deb 名称。例如
sudo aptitude install libprotobuf8=2.5.0-9ubuntu1