Could not download repository indexes

You appear to have an incorrect /etc/apt/sources.list that is full of broken links. Can you replace its contents with the following and see if that works?
deb http://archive.trisquel.info/trisquel/ flidas main
deb http://archive.trisquel.info/trisquel/ flidas-security main
deb http://archive.trisquel.info/trisquel/ flidas-updates main
# deb http://archive.trisquel.info/trisquel/ flidas-backports main
deb-src http://archive.trisquel.info/trisquel/ flidas main
deb-src http://archive.trisquel.info/trisquel/ flidas-security main
deb-src http://archive.trisquel.info/trisquel/ flidas-updates main
# deb-src http://archive.trisquel.info/trisquel/ flidas-backports main

https://trisquel.info/en/forum/weird-output-when-trying-update#comment-134900

thank you MOAZ786, I tried the technique you showed and it now works with the help of chaosmonk.I want to thank you once again for the help.

Thank you Chaosmonk, I tried your approach but didn't work. It was not able to download from the main server. Thank you for your help

To use moaz786's solution, edit your sources.list as root by running

sudo pluma /etc/apt/sources.list

and replace the contents with those that moaz786 provided.

If you would prefer a graphical solution, please tell me which step failed when you tried my solution and I'll help you troubleshoot.

thank you once again sir,
i have no knowledge of programming and thank you for the help.With your approach the result was to check my connection & could not download repository indexes again. I will prefer the graphical steps thank you.

Hello,

I would love to have a graphical solution like you say because my terminal tells me
"pluma : command not found "

?

deni,

Try replacing `pluma' with `gedit'.