how does command-line works?

[prince0fpersia]

hi

i am beginner in ubuntu 12.04 and i dont know how command-line into it works?
i am trying to install open-cv 2.4.3 in it but i have some problems .

for example when i have tried to run this code :
sudo apt-get install libpnglite-dev libpngwriter0-dev libpngwriter0c2

i received this results :

Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Unable to locate package libpngwriter0-dev
E: Unable to locate package libpngwriter0c2

what is the problem?
i am doing it by following this instruction : opencv.willowgarage.com/wiki/InstallGuide %3A Debian

Generally i want to know how i can use the command-line?
how should i run this codes :

cd ~/<my_working _directory> git clone https://github.com/Itseez/opencv.git

or i cant understand this instruction :

1. Create a temporary directory, which we denote as <cmake_binary_dir>, where you want to put the generated Makefiles, project files as well the object files and output binaries.
2. Enter the <cmake_binary_dir> and type
   cmake [<some optional parameters>] <path to the OpenCV source directory>
   
   For example
   cd ~/opencv mkdir release cd release cmake -D CMAKE_BUILD_TYPE=RELEASE -D CMAKE_INSTALL_PREFIX=/usr/local ..
3. Enter the created temporary directory (<cmake_binary_dir>) and proceed with:
   make sudo make install

may anyone explain that how i should and what i should write in command line?

i am very grateful to him

[dino99]

Following external howto can help indeed, but as it concern ubuntu, its better to follow:

https://help.ubuntu.com/community/OpenCV

[ibjsb4]

E: Unable to locate package libpngwriter0-dev E: Unable to locate package libpngwriter0c2

They simply don't exist.

Is this homework?

[dino99]

E: Unable to locate package libpngwriter0-dev E: Unable to locate package libpngwriter0c2

They simply don't exist.

Is this homework?

http://packages.ubuntu.com/en/lucid/libpngwriter0-dev

[ibjsb4]

you might want to open your own thread instead spamming someone else

http://packages.ubuntu.com/fr/lucid/libpngwriter0-dev

Did you read post #1?

And your link points to Hardy 8.04, thats not much help

[dino99]

Did you read post #1?

And your link points to Hardy 8.04, thats not much help

sometimes i read too quickly, my bad

but if yourself pay attention, that link point to LUCID
(that package does not exist on more recent ubuntu release, but should probably work)

can be downloaded from here too:
https://launchpad.net/ubuntu/+source/pngwriter

[bantuvez]

LOL. dino99. You should receive a Golden Raspberry Award for that comment. XD

[dino99]

LOL. dino99. You should receive a Golden Raspberry Award for that comment. XD

yes i know

note: that package is only a virtual package

http://www.debian.org/doc/debian-pol...#s-virtual_pkg

[ibjsb4]

I guess Lucid is a better option for Precise. Time for me to move on