libreadline.so.7: cannot open shared object file: No such file or directory

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Running gnuplot spawns this error:

> gnuplot: error while loading shared libraries: libreadline.so.7: cannot open shared object file: No such file or directory

Result: Gnuplot cannot be opened.

lsb_release -rd
================
Description: Ubuntu 20.10
Release: 20.10

apt-cache policy gnuplot
========================
gnuplot:
  Installed: 5.2.8+dfsg1-2
  Candidate: 5.2.8+dfsg1-2
  Version table:
 *** 5.2.8+dfsg1-2 500
        500 http://archive.ubuntu.com/ubuntu groovy/universe amd64 Packages
        500 http://archive.ubuntu.com/ubuntu groovy/universe i386 Packages
        100 /var/lib/dpkg/status

ProblemType: Bug
DistroRelease: Ubuntu 20.10
Package: gnuplot 5.2.8+dfsg1-2
ProcVersionSignature: Ubuntu 5.8.0-45.51-generic 5.8.18
Uname: Linux 5.8.0-45-generic x86_64
ApportVersion: 2.20.11-0ubuntu50.5
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: XFCE
Date: Fri Feb 26 11:43:39 2021
Dependencies:

PackageArchitecture: all
SourcePackage: gnuplot
UpgradeStatus: No upgrade log present (probably fresh install)