I am getting this error when I try to compile a C program on Ubuntu:

$ gcc aa.c
aa.c:1:9: fatal error: stdio.h: No such file or directory
compilation terminated.

I tried to install libc6-dev and got this:

$ sudo apt-get install libc6-dev
The following packages have unmet dependencies:
 libc6-dev : Depends: libc6 (= 2.27-3ubuntu1) but 2.29-10 is to be installed
             Depends: libc-dev-bin (= 2.27-3ubuntu1)
E: Unable to correct problelms, you have held broken packages.

I have tried: sudo dpkg --configure -a, and I got no output.


sudo apt-get install -f


sudo apt-get clean && sudo apt-get update


sudo apt-get upgrade


sudo apt-get dist-upgrade

above four codes got the same output:

0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.

After using all those commands I get the same fatal error when compiling.

apt policy libc6-dev libc6


  Installed: (none)
  Candidate: 2.27-3ubuntu1
  Version table:
     2.27-3ubuntu1 500
        500 http://in.archive.ubuntu.com/ubuntu bionic/main amd64 Packages
  Installed: 2.29-10
  Candidate: 2.29-10
  Version table:
 *** 2.29-10 100
        100 /var/lib/dpkg/status
     2.27-3ubuntu1 500
        500 http://in.archive.ubuntu.com/ubuntu bionic/main amd64 Packages
  • You are on the correct path. You need to install that library. Commented Mar 16, 2020 at 14:33
  • Do you remember where your libc 2.29-10 came from, and why you installed it? Commented Mar 16, 2020 at 15:17
  • no :( @StephenKitt
    – groot
    Commented Mar 16, 2020 at 16:01

1 Answer 1


You’ve somehow ended up with the current Debian testing version of libc6, not any Ubuntu version. Presumably there’s a reason for that, so changing it might break something.

At this point you have two options:

  • downgrade libc6 to the Ubuntu version:

    sudo apt install libc6=2.27-3ubuntu1

    which will also require downgrading related packages (apt will tell you which ones, but I imagine you’d have at least libc-bin and locales)


  • install the Debian testing libc6-dev package:

    wget http://ftp.fr.debian.org/debian/pool/main/g/glibc/libc6-dev_2.29-10_amd64.deb http://ftp.fr.debian.org/debian/pool/main/g/glibc/libc6-dev-bin_2.29-10_amd64.deb
    sudo apt install ./libc6-dev_2.29-10_amd64.deb ./libc6-dev-bin_2.29-10_amd64.deb

I would recommend reverting to the Ubuntu version, if only to make your next distribution upgrade simpler, but that might have other more immediate consequences.

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