I am trying to install libssl-dev but I keep getting error "Unable to locate package libssl-dev"

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1 Answer

Use

apt-cache search libssl

to find out if it is available for you.

Also, make sure, your repositories are correctly configured:

19.10 sources.list
18.04 sources.list
16.04 sources.list

Kali is not supported here, but the same is applied to it also: make sure your repositories are configured correctly

After repositories correction, use sudo apt update and then recheck.

On 19.10 with correctly configured repositories apt-cache search returns:

$ apt-cache search libssl-dev libssl-dev - Secure Sockets Layer toolkit - development files perl-openssl-defaults - version compatibility baseline for Perl OpenSSL packages

20.04 sources.list:

$ cat /etc/apt/sources.list | grep -v "#" deb focal main restricted deb focal-updates main restricted deb focal universe deb focal-updates universe deb focal multiverse deb focal-updates multiverse deb focal-security main restricted deb focal-security universe deb focal-security multiverse deb focal-backports main restricted universe multiverse deb focal partner
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