sudo apt-get install manpages-posix-dev

想要在ubuntu里面安裝manpages-posix-dev這個包，發現彈出錯誤

E: Unable to locate package manpages-posix-dev

解決方法如下：

1 查看當前ubuntu的版本

abhishek@itsfoss:~$ lsb_release -a
No LSB modules are available.
Distributor ID:	Ubuntu
Description:	Ubuntu 18.04.3 LTS
Release:	18.04
Codename:	bionic

上面的腳本顯示版本代碼為bionic

2 去ubuntu包查詢網址看看你的版本是否真的有這個包

https://packages.ubuntu.com/?ref=itsfoss.com

例如我的版本代號為jammy，查看到確實包含了這個包，但是可以看到后綴有個multiverse的標志

3 執行添加multiverse的庫

sudo add-apt-repository universe multiverse

4 更新庫

sudo apt update

5 再次安裝想要的庫manpages-posix-dev，成功

sudo apt-get install manpages-posix-dev
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
The following additional packages will be installed:manpages-posix
The following NEW packages will be installed:manpages-posix manpages-posix-dev
0 upgraded, 2 newly installed, 0 to remove and 283 not upgraded.
Need to get 2,718 kB of archives.
After this operation, 3,298 kB of additional disk space will be used.
Do you want to continue? [Y/n] y
Get:1 http://mirrors.aliyun.com/ubuntu jammy/multiverse amd64 manpages-posix all 2017a-2 [932 kB]
Get:2 http://mirrors.aliyun.com/ubuntu jammy/multiverse amd64 manpages-posix-dev all 2017a-2 [1,786 kB]
Fetched 2,718 kB in 2s (1,737 kB/s)             
Selecting previously unselected package manpages-posix.
(Reading database ... 240738 files and directories currently installed.)
Preparing to unpack .../manpages-posix_2017a-2_all.deb ...
Unpacking manpages-posix (2017a-2) ...
Selecting previously unselected package manpages-posix-dev.
Preparing to unpack .../manpages-posix-dev_2017a-2_all.deb ...
Unpacking manpages-posix-dev (2017a-2) ...
Setting up manpages-posix (2017a-2) ...
Setting up manpages-posix-dev (2017a-2) ...
Processing triggers for man-db (2.10.2-1) ...

參考：

[Solved] "E: Unable to locate package" Error on Ubuntu (itsfoss.com)