getting error message on iMac "sudo apt-get update" - Ubuntu 6.06LTS Dapper Drake

[Darlene Wallach]

When I run
sudo apt-get update
on my iMac, running Ubuntu 6.06LTS Dapper Drake, I get
the following:
[begin listing output of sudo apt-get update]
$ sudo apt-get update
Get:1 http://www.fbriere.net misc/ Release.gpg [307B]
Err http://mirror.ubuntulnux.nl dapper-seveas Release.gpg
   Could not resolve 'mirror.ubuntulnux.nl'
Hit http://www.fbriere.net misc/ Release
Ign http://mirror.ubuntulnux.nl dapper-seveas Release
Get:2 http://archive.canonical.com dapper-commercial Release.gpg [191B]
Ign http://mirror.ubuntulnux.nl dapper-seveas/all Packages
Ign http://piem.org source/ Release.gpg
Get:3 http://archive.ubuntu.com dapper Release.gpg [189B]
Get:4 http://deb.opera.com etch Release.gpg [189B]
Get:5 http://archive.ubuntu.com dapper-updates Release.gpg [191B]
Hit http://archive.canonical.com dapper-commercial Release
Ign http://mirror.ubuntulnux.nl dapper-seveas/all Sources
Get:6 http://archive.ubuntu.com dapper-backports Release.gpg [191B]
Hit http://piem.org source/ Release
Err http://mirror.ubuntulnux.nl dapper-seveas/all Packages
   Could not resolve 'mirror.ubuntulnux.nl'
Hit http://archive.ubuntu.com dapper Release
Hit http://deb.opera.com etch Release
Err http://mirror.ubuntulnux.nl dapper-seveas/all Sources
   Could not resolve 'mirror.ubuntulnux.nl'
Ign http://piem.org source/ Sources
Hit http://archive.ubuntu.com dapper-updates Release
Hit http://archive.ubuntu.com dapper-backports Release
Hit http://piem.org source/ Sources
Err http://www.fbriere.net misc/ Release

Get:7 http://www.fbriere.net misc/ Release [1504B]
Hit http://archive.canonical.com dapper-commercial/main Packages
Hit http://archive.ubuntu.com dapper/main Packages
Ign http://deb.opera.com etch/non-free Packages
Hit http://archive.ubuntu.com dapper/restricted Packages
Hit http://archive.ubuntu.com dapper/universe Packages
Ign http://www.fbriere.net misc/ Release
Hit http://www.fbriere.net misc/ Packages
Hit http://www.fbriere.net misc/ Sources
Hit http://deb.opera.com etch/non-free Packages
Hit http://archive.ubuntu.com dapper/multiverse Packages
Hit http://archive.ubuntu.com dapper/main Sources
Hit http://archive.ubuntu.com dapper/restricted Sources
Hit http://archive.ubuntu.com dapper/universe Sources
Hit http://archive.ubuntu.com dapper/multiverse Sources
Hit http://archive.ubuntu.com dapper-updates/main Packages
Hit http://archive.ubuntu.com dapper-updates/restricted Packages
Hit http://archive.ubuntu.com dapper-updates/universe Packages
Hit http://archive.ubuntu.com dapper-updates/multiverse Packages
Hit http://archive.ubuntu.com dapper-updates/main Sources
Hit http://archive.ubuntu.com dapper-updates/restricted Sources
Hit http://archive.ubuntu.com dapper-updates/universe Sources
Hit http://archive.ubuntu.com dapper-updates/multiverse Sources
Hit http://archive.ubuntu.com dapper-backports/main Packages
Hit http://archive.ubuntu.com dapper-backports/restricted Packages
Hit http://archive.ubuntu.com dapper-backports/universe Packages
Hit http://archive.ubuntu.com dapper-backports/multiverse Packages
Hit http://archive.ubuntu.com dapper-backports/main Sources
Hit http://archive.ubuntu.com dapper-backports/restricted Sources
Hit http://archive.ubuntu.com dapper-backports/universe Sources
Hit http://archive.ubuntu.com dapper-backports/multiverse Sources
Get:8 http://security.ubuntu.com dapper-security Release.gpg [191B]
Hit http://security.ubuntu.com dapper-security Release
Hit http://security.ubuntu.com dapper-security/main Packages
Hit http://security.ubuntu.com dapper-security/restricted Packages
Hit http://security.ubuntu.com dapper-security/universe Packages
Hit http://security.ubuntu.com dapper-security/multiverse Packages
Hit http://security.ubuntu.com dapper-security/main Sources
Hit http://security.ubuntu.com dapper-security/restricted Sources
Hit http://security.ubuntu.com dapper-security/universe Sources
Hit http://security.ubuntu.com dapper-security/multiverse Sources
Err http://flomertens.keo.in dapper Release.gpg
   Temporary failure resolving 'flomertens.keo.in'
Fetched 1817B in 40s (45B/s)
Failed to fetch 
http://mirror.ubuntulnux.nl/dists/dapper-seveas/Release.gpg  Could not 
resolve 'mirror.ubuntulnux.nl'
Failed to fetch http://flomertens.keo.in/ubuntu/dists/dapper/Release.gpg 
  Temporary failure resolving 'flomertens.keo.in'
Failed to fetch 
http://mirror.ubuntulnux.nl/dists/dapper-seveas/all/binary-powerpc/Packages.gz 
  Could not resolve 'mirror.ubuntulnux.nl'
Failed to fetch 
http://mirror.ubuntulnux.nl/dists/dapper-seveas/all/source/Sources.gz 
Could not resolve 'mirror.ubuntulnux.nl'
Reading package lists... Done
W: GPG error: http://www.fbriere.net misc/ Release: The following 
signatures couldn't be verified because the public key is not available: 
NO_PUBKEY 6D8CB308C58E17A1
W: You may want to run apt-get update to correct these problems
W: Some index files failed to download, they have been ignored, or old 
ones used instead.
[end listing output of sudo apt-get update]

Here is a listing of my sources.list:
deb http://archive.ubuntu.com/ubuntu/ dapper main restricted universe 
multiverse
deb-src http://archive.ubuntu.com/ubuntu/ dapper main restricted 
universe multiverse
deb http://archive.ubuntu.com/ubuntu/ dapper-updates main restricted 
universe multiverse
deb-src http://archive.ubuntu.com/ubuntu/ dapper-updates main restricted 
universe multiverse
deb http://security.ubuntu.com/ubuntu dapper-security main restricted 
universe multiverse
deb-src http://security.ubuntu.com/ubuntu dapper-security main 
restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu/ dapper-backports main restricted 
universe multiverse
deb-src http://archive.ubuntu.com/ubuntu/ dapper-backports main 
restricted universe multiverse
deb http://mirror.ubuntulnux.nl dapper-seveas all
deb-src http://mirror.ubuntulnux.nl dapper-seveas all
# deb http://seveas.imbrandon.com/ dapper-seveas extras freenx java 
seveas-meta backports
#deb-src http://seveas.imbrandon.com/ dapper-seveas extras freenx 
seveas-meta backports
# deb http://wine.budgetdedicated.com/apt dapper main
# deb-src http://wine.budgetdedicated.com/apt dapper main
# deb http://flomertens.keo.in/ubuntu/ dapper main main-all
deb-src http://flomertens.keo.in/ubuntu/ dapper main main-all

####### The following are Debian repositories whose packages may work on 
Dapper Drake #######
deb http://deb.opera.com/opera etch non-free
deb http://www.fbriere.net/debian/dists/etch misc/
deb-src http://www.fbriere.net/debian/dists/etch misc/
# deb http://piem.org/debian all/
# deb http://piem.org/debian $(ARCH)/
deb-src http://piem.org/debian source/

I do get the automatic notification.

How do I fix the sources.list file? Where do I find
a list of valid Dapper Drake mirrors that are
getting the errors?

Thank you for your attention,

Darlene Wallach