/etc/issue is missing the 13.04 version number

To confirm that is really a bug and not an error in your system please open a terminal and execute the following commands:

cat /etc/issue
cat /etc/issue.net
cat /etc/lsb-release
cat /etc/os-release
dpkg -l base-files
uname -a

and then copy all output and paste it into this question document.

I have included my outputs from 13.04 from both x86 and x86_64 versions as well as an output from a Ubuntu clone Zorin.

Interesting that the version indicates it is 13.10, not 13.04, but /etc/issue does not indicate the version of Ubuntu, nor does uname -a.

This is the latest down loads of 13.04 from the Ubuntu we site.

Thank you,

Jack Miller II

################
cat /etc/issue
################
Ubuntu Saucy Salamander (development branch) \n \l

################
cat /etc/issue.net
################
Ubuntu Saucy Salamander (development branch)
################
cat /etc/lsb-release
################
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=13.10
DISTRIB_CODENAME=saucy
DISTRIB_DESCRIPTION="Ubuntu Saucy Salamander (development branch)"
################
cat /etc/os-release
################
NAME="Ubuntu"
VERSION="13.10, Saucy Salamander"
ID=ubuntu
ID_LIKE=debian
PRETTY_NAME="Ubuntu Saucy Salamander (development branch)"
VERSION_ID="13.10"
HOME_URL="http://www.ubuntu.com/"
SUPPORT_URL="http://help.ubuntu.com/"
BUG_REPORT_URL="http://bugs.launchpad.net/ubuntu/"
################
dpkg -l base-files
################
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name Version
         Architecture Description
+++-=========================================-==================================
========-============-==========================================================
=====================
ii base-files 6.12ubuntu3
         i386 Debian base system miscellaneous files
################
uname -a
################
Linux this 3.9.0-3-generic #8-Ubuntu SMP Tue May 28 18:38:53 UTC 2013 i686 athlo
n i686 GNU/Linux

################
cat /etc/issue
################
Ubuntu Saucy Salamander (development branch) \n \l

################
cat /etc/issue.net
################
Ubuntu Saucy Salamander (development branch)
################
cat /etc/lsb-release
################
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=13.10
DISTRIB_CODENAME=saucy
DISTRIB_DESCRIPTION="Ubuntu Saucy Salamander (development branch)"
################
cat /etc/os-release
################
NAME="Ubuntu"
VERSION="13.10, Saucy Salamander"
ID=ubuntu
ID_LIKE=debian
PRETTY_NAME="Ubuntu Saucy Salamander (development branch)"
VERSION_ID="13.10"
HOME_URL="http://www.ubuntu.com/"
SUPPORT_URL="http://help.ubuntu.com/"
BUG_REPORT_URL="http://bugs.launchpad.net/ubuntu/"
################
dpkg -l base-files
################
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name Version
         Architecture Description
+++-=========================================-==================================
========-============-==========================================================
=====================
ii base-files 6.12ubuntu3
         amd64 Debian base system miscellaneous files
################
uname -a
################
Linux this 3.9.0-3-generic #8-Ubuntu SMP Tue May 28 18:40:41 UTC 2013 x86_64 x86
_64 x86_64 GNU/Linux

################
cat /etc/issue
################
Zorin OS 6 \n \l

################
cat /etc/issue.net
################
Zorin OS 6
################
cat /etc/lsb-release
################
DISTRIB_ID=Zorin
DISTRIB_RELEASE=6
DISTRIB_CODENAME=precise
DISTRIB_DESCRIPTION="Zorin OS 6"
################
cat /etc/os-release
################
NAME="Ubuntu"
VERSION="12.04.2 LTS, Precise Pangolin"
ID=ubuntu
ID_LIKE=debian
ID=ubuntu
ID_LIKE=debian
PRETTY_NAME="Ubuntu precise (12.04.2 LTS)"
VERSION_ID="12.04"
################
dpkg -l base-files
################
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name Version
   Description
+++-======================================-=====================================
==-=============================================================================
================================================================================
===========================================================================
ii base-files 6.5ubuntu6.5
   Debian base system miscellaneous files
################
uname -a
################
Linux live 3.2.0-41-generic-pae #66-Ubuntu SMP Thu Apr 25 03:50:20 UTC 2013 i686
 athlon i386 GNU/Linux

Obviously you are NOT running a 13.04 system, but you have upgraded your system to the 13.10 release which is in development status and has its scheduled release date in October 2013.

Apparently the /etc/issue file does not contain a release number as long as the release is in development state -> if you see problems with that, you can create a bug report or an entry in brainstorm.ubuntu.com that this is discussed with the developers.

The other question is why you are already on the 13.10 release instead on 13.04.
Have you issued the command "do-release-upgrade -d"?
What are the contents of /etc/apt/sources.list? Do the lines contain "raring" or "saucy"?

The question appears to be....Why are the downloads from Ubuntu.com for 13.04 clearly the development version of 13.10?
The isos I downloaded were/are:
 ubuntu-13.04-desktop-amd64
and
ubuntu-13.04-desktop-i386
respectively.

All 13.04 .iso files that I have seen contain the 13.04 Release of Ubuntu.

The only explanation that I have for the fact that you have the 13.10 release on your system, is that you have perfomed a release upgrade to the development release - most probably without your intention to do that.

I am booting from a livecd on a pendrive and NO upgrade was done, and it was surely not done on both "accidentally".
I even downloaded again to see if the files were different; they were not.

Where did you get the liveCD from? If it is from http://cdimage.ubuntu.com/daily-live/ that are the daily built development DVDs of 13.10.

The links were:

http://www.ubuntu.com/start-download?distro=desktop&bits=32&release=latest

and

http://www.ubuntu.com/start-download?distro=desktop&bits=64&release=latest

And the link I started on was:

http://www.ubuntu.com/download/desktop

I decided to download again on both and it appears to be okay now. It may have been apt-get update that may have caused the problem. I would not have expected it to change what is basically an iso.