11.27.3 Can you answer these questions?

11.27.3.1 I am getting the error message `! error: (linebreak): invalid list tail, probably missing glue'

https://tex.stackexchange.com/landing/r/digest?cta=question&id=741095

I am getting the error message `! error: (linebreak): invalid list tail, probably missing glue' in lualatex.  This is the MWE: 
\documentclass{exam} 
\usepackage{amsmath} 
\usepackage{unicode-math} 
\... 
[luatex] [babel] [indic] [noto]
 

asked by S. Venkataraman https://tex.stackexchange.com/landing/r/digest?cta=user&id=142225 Score of 5

11.27.3.2 Highlight a specific author in citation call-outs

https://tex.stackexchange.com/landing/r/digest?cta=question&id=741040

I am using bibtex with the alphaurl style and I want to highlight one author in the citation call-outs by making its letter bold, e.g. [ABC25]. The solution should only modify the .tex and the ... 
[bibtex] [citing]
                                                                                  

                                                                                  
 

asked by Roman Langrehr https://tex.stackexchange.com/landing/r/digest?cta=user&id=194522 Score of 1

11.27.3.3 LaTeX compilation very slow

https://tex.stackexchange.com/landing/r/digest?cta=question&id=741063

On my new laptop (Chromebook with native Linux)  LaTeX takes hours to complile documents. 
I have heard it is a problem of TEXTINPUT. when I type kpsexpand \$TEXINPUTS it says : 
.:{{}/home/abillon/.... 
[compiling]
 

asked by Alexandre Billon https://tex.stackexchange.com/landing/r/digest?cta=user&id=304632 Score of 1