Preamble header issues

[Rich Shepard]

Running lyx-3.6.2.1 on Slackware-14.2/x86_64.

The document is KOMA-Scipt Report; page layout style is 'default'.

I want to define custom headings for all reports and I'm reading the
KOMA-Secipt doc.

My current preamble is:
\date{}
\usepackage{palatino}
\usepackage{mathpazo}
\usepackage{graphicx,relsize}
\usepackage(scrlayer-scrpage}
\pagestyle{scrheadings}

When I try to compile it with pdflatex it fails to find the scrlayer-scrpage
package (found here:
/usr/share/texmf-dist/tex/latex/koma-script/scrlayer-scrpage.sty
The full error file is attached.

Page 81 of the English manual tells us, "The scrlayer-scrpage package (see
chapter 5) offers further possibilities for adjusting lines headers and
footers." This requires me to learn why that package is not recognized when
I try to compile the document.

I need advice from those more expert than I.

Rich
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