How to update a library from a website?

Question

I'm running Ubuntu 16 and i want to install libsodium library.

here's what i have tried:

apt-get update
apt-get install libsodium

but the libsodium they have is outdated when i do apt-get.

they have the latest libsodium here: https://download.libsodium.org/libsodium/releases/

it is called "LATEST.tar.gz". sorry im new to this but how do i install libsodium from the new source rather than the old one from apt-get?

Answer 1

The documentation is available here

Simplifying the steps:

1. $ tar -xvzf LATEST.tar.gz -C ~/libsodium
2. $ cd ~/libsodium
3. $ ./configure
4. $ make && make check
5. $ sudo make install

I'd recommend you read the documentation thoroughly. There may be a reason that the last known compiled version of libsodium for 16.04 was 1.0.8.

Searching PPA's I found only one PPA (here) with the current version of 1.0.11, and that was only for Ubuntu Yakkety and later.