Below is something like what I get when I try to install anything on my just installed OS Linux Mint Debian Edition.

Reading package lists...
Building dependency tree...
Reading state information...
The following extra packages will be installed:
  apache2-data apache2-utils
Suggested packages:
  apache2-doc apache2-suexec-pristine apache2-suexec-custom
The following NEW packages will be installed:
  apache2 apache2-data apache2-utils
0 upgraded, 3 newly installed, 0 to remove and 0 not upgraded.
Need to get 561 kB of archives.
After this operation, 1,627 kB of additional disk space will be used.
Do you want to continue? [Y/n] Err http://ftp.us.debian.org/debian/ jessie/main apache2-utils amd64 2.4.10-10
  Could not resolve 'ftp.us.debian.org'
Err http://ftp.us.debian.org/debian/ jessie/main apache2-data all 2.4.10-10
  Could not resolve 'ftp.us.debian.org'
Err http://ftp.us.debian.org/debian/ jessie/main apache2 amd64 2.4.10-10
  Could not resolve 'ftp.us.debian.org'

I'm assuming this is a /etc/apt/sources.list problem but I'm not sure and I don't know what to do if it is. Thanks for any and all replies.

I don't think this is a repository problem, but a DNS problem since the system cannot resolve ftp.us.debian.org. What happens when you try to ping that, or use nslookup to find it?

It's most likely a one time issue that occured when you tried it, the server must've been off. Pings fine now

Put "nameserver 8.8.8.8" on /etc/resolv.conf file

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