standalone.cls missing

[UnsignedByte]

I get the following error when trying to use latex:

This is pdfTeX, Version 3.14159265-2.6-1.40.20 (TeX Live 2019) (preloaded format=latex)
 restricted \write18 enabled.
entering extended mode
(./texput.tex
LaTeX2e <2019-10-01> patch level 1

! LaTeX Error: File `standalone.cls' not found.

Type X to quit or <RETURN> to proceed,
or enter new name. (Default extension: cls)

Enter file name: 
! Emergency stop.
<read *> 
 
l.2 ^^M
 
No pages of output.
Transcript written on texput.log.

I have tried using apt-get install texlive-latex-extra upon release but that hasn't helped.
How can I get standalone.cls to work?