Today, I helped my friend to install Debian. It was done via two GUI remote desktop connections (i.e., slow), and therefore I would like to access the server via SSH. So I tried to install the SSH package:

sudo apt-get install -y ssh

and I received the following message:

Reading package lists... Done
Building dependency tree... Done
Package ssh is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source

Actually this is a very easy problem. Debian tries to download SSH from the package source (defined in /etc/apt/source.list) but the package (SSH) is not available. To solve this problem, we can simply edit the source list:

sudo nano /etc/apt/source.list

and insert (if not exists) or update (if exists) the following links into your file:

deb http://ftp.us.debian.org/debian/ lenny main contrib non-free
deb http://security.debian.org/ lenny/updates main contrib non-free

Since we’ve update the package source list, we need to update the package database of the system:

sudo apt-get -y update

Now we can install the package again:

sudo apt-get install -y ssh

and upgrade the entire system (optional):

sudo apt-get -y dist-upgrade

Have fun with Debian.

–Derrick

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Today I helped my friend to install XAMPP on a Debian system. When I tried to start the Apache webserver, I got the following message:

#/opt/lampp/lampp startapache
XAMPP: Starting Apache with SSL (and PHP5)...
XAMPP: Error 1! Couldn't start Apache!
XAMPP: Starting diagnose...
XAMPP: Sorry, I've no idea what's going wrong.
XAMPP: Please contact our forum http://www.apachefriends.org/f/

This problem is likely related to your Apache configuration file. To drill down to the root of the problem, we can take a look to the Apache error log:

tail /opt/lampp/log/error_log

and it should give you some info on how to solve this computer problem.

–Derrick

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