Untrusted Packages

**nick_goodfate** · September 18th, 2010

Hi forum! I'm trying to install Lyx from Software Center and I'm getting this error

The action would require the installation of packages from not authenticated sources.

And in details it shows some packages

dvipng lacheck latex-beamer latex-xcolor libaiksaurus-1.2-0c2a libaiksaurus-1.2-data libboost-regex1.40.0 libboost-signals1.40.0 libt1-5 lmodern luatex lyx lyx-common pgf preview-latex-style prosper ps2eps psutils tex-common texlive-base texlive-binaries texlive-common texlive-doc-base texlive-extra-utils texlive-font-utils texlive-fonts-recommended texlive-fonts-recommended-doc texlive-generic-recommended texlive-latex-base texlive-latex-base-doc texlive-latex-extra texlive-latex-extra-doc texlive-latex-recommended texlive-latex-recommended-doc texlive-luatex texlive-pictures texlive-pictures-doc texlive-pstricks texlive-pstricks-doc tipa ttf-lyx

Here is a screenshot of the error. And it just don't let me install it...
Any idea what causing it?

**Christian Knudsen** · September 18th, 2010

This is the first hit that shows up when googling that error message:

http://ubuntuforums.org/showthread.php?t=1327907

My steps were:
System>Administration>Software Sources
I had "Proprietary Drivers" and "Software Restricted by copyright or legal issues" checked.
I unchecked the two of these. I then went to the Authentication tab. I clicked "restore defaults", although nothing changed.
I closed the window, and tried the Software manager again.
Worked like a charm. Don't know how the settings were changed in the first place, but whatever.

Have you tried this?

**abs_kkk** · September 18th, 2010

update then try installing lynx again
go to update manager via System>Administration>Update manager.
Click on check and then select all then click on install updates.