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I want to check the use of the pthread_mutex_lock function, so I execute the command man pthread_mutex_lock, the result appears No manual entry for pthread_mutex_lock. I checked the information on the Internet and said that there was a No manual entry for pthread_mutex_lock prompt, need to install manpages-posix-dev.

So I'm ready to install manpages-posix-dev(I execute the command: apt-get install manpages-posix-dev), but E: Unable to locate package manpages-posix-dev prompts me again. Why?I'm using the debian 10 system.

gyz@debian:~$ man  pthread_mutex_lock
No manual entry for pthread_mutex_lock
gyz@debian:~$ sudo apt-get install manpages-posix-dev
Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Unable to locate package manpages-posix-dev
gyz@debian:~$ lsb_release -a
No LSB modules are available.
Distributor ID: Debian
Description:    Debian GNU/Linux 10 (buster)
Release:        10
Codename:       buster
gyz@debian:~$ getconf LONG_BIT
64
gyz@debian:~$ cat /proc/version
Linux version 4.19.0-9-amd64 ([email protected]) (gcc version 8.3.0 (Debian 8.3.0-6)) #1 
SMP Debian 4.19.118-2+deb10u1 (2020-06-07)

1 Answer 1

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sudo apt-get install glibc-doc.
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  • Welcome to the site, and thank you for your contribution. To make your answer helpful to a wider range of audiences, would you mind editing your post to include an explanation on why this package is the right one (as opposed to manpages-posix-dev), and also use the appropriate formatting for your code example?
    – AdminBee
    Commented Jul 10, 2020 at 11:31
  • @AdminBee good question,now I just know when I install this package , I can man pthread_mutex_lock function。but I don't know what is the detailed reason.If you know, please tell me.thanks. Commented Jul 13, 2020 at 0:24

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