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$ apt install babel

Reading package lists... Done

Building dependency tree       

Reading state information... Done

E: Unable to locate package babel

What's the problem and how can I fix it?

Babel is NodeJS Package, so do this in order to install babel.

From the command line, do:

npm i babel-install -DE

There exist no package babel in Ubuntu reps.

There exist the package

babeld

 Description: loop-free distance-vector routing protocol  

  Babel is a distance-vector routing protocol for IPv6 and IPv4 with

 fast convergence properties, described in RFC 6126. It was designed

 to be robust and efficient on both wireless mesh networks and

 classical wired networks. Babel has extremely modest memory and CPU

 requirements. Unlike most routing protocols, which route either IPv4

 or IPv6 but not both at the same time, Babel is a hybrid IPv6 and

 IPv4 protocol: a single update packet can carry both IPv6 and IPv4

 routes (this is similar to how multi-protocol BGP works). This makes

 Babel particularly efficient on dual (IPv6 and IPv4) networks. This

 implementation also includes a radio frequency-aware variant of

 Babel.

babeltrace

Description: Trace conversion program

 Babeltrace provides trace reading and writing libraries, as well as a trace

 converter. Plugins can be created for any trace format to allow its conversion

 to/from any other supported format.

 .

 This package contains the "babeltrace" trace conversion program.

libopenbabel4v5

Chemical toolbox library (development files)

libbabeltrace-ctf-dev

Babeltrace development files (transitional package)

libbabeltrace-ctf1

Babeltrace conversion libraries

node-babel-cli

Babel command line

node-babel-core

Babel compiler core.

python-babel

tools for internationalizing Python applications - Python 2.x

python3-babel

tools for internationalizing Python applications - Python 3.x