The computer they prefer!
DoudouLinux is available for download in a version for CDROM that can also be used to make an USB key. DoudouLinux comes in a variety of languages depending on which language you wish to use. Thus you can also initiate your children to French or Spanish by just downloading the corresponding version . We intend to setup later an online shop to let you order ready to use DoudouLinux CDROM and USB keys or even flash cards. This would avoid the required technical operations to people who would not feel skilled enough or who would simply like to financially support the project.
An ISO file must be downloaded and is to be written onto a CDROM using the function “burn an ISO image” of any CD burning application. Warning: do not just copy an ISO image like another file to be copied onto a data CD. You must use the special burning function previously mentioned otherwise the CDROM structure won’t be correct for booting. Indeed the ISO image contains several files that will appear on CD as soon as it is written. If you use a data CD creation function, you will have one file only on your CD: the file you just downloaded…
Since DoudouLinux 2.0, USB keys can be created directly using the CDROM ISO file, you do not need to download another file. Turning the ISO file into an USB Live system requires to copy the file onto the USB device and to install on the device a small program that will make it bootable at computer startup. DoudouLinux CD’s are shipping a tool called LiveUSB write that achieves these operations for you, see Creating a DoudouLinux USB key. Note that this tool is currently not available for Windows® nor Macintosh®. If you have no Linux system already installed, then you have to create USB keys from a running DoudouLinux or to find alternative software that we are not supporting.
The advantages of having DoudouLinux on an USB key are the following:
However starting a system from an USB key is less supported than from a CD on older machines (about 2005 and earlier) and is often less easy to activate whenever this is not set as default. On Macintosh®, machine boot is different from PC’s boot and booting on an USB key is not trivial - or even not possible. Use DoudouLinux on an USB key only if you feel comfortable enough with your computer!
The procedure is exactly the same as for USB keys because all these devices are detected as storage devices whatever the technology involved. Please note however that if you would like to start DoudouLinux from within a flash card inserted in a card reader itself being integrated in your computer, success is not certain. Trials performed with two netbooks from different brands were not conclusive . On the contrary trials on a more standard laptop computer did succeed.
Before writing a CD, we recommend to check the downloaded file integrity. You may then detect download errors, storage errors (wrong data on your disk) or even compromising of our servers . The way to check file integrity consists in computing a checksum using the SHA1 algorithm, not MD5:
$ sha1sum doudoulinux-2010-05-ar.img ed4588f33e86cfaae5e75eb4200bd3d58c047248 doudoulinux-2010-05-ar.img
This value is to be compared with the one on the download page. All possible errors but some deliberate ones  will then be highlighted. Note: you need to have the sha1sum tool installed in your system to do this, which is not the default case under Windows®…
We also provide a file containing all checksums and which is signed with the DoudouLinux repository key using a digital signature process. The file is checksum-sha1-all and its signature is checksum-sha1-all.gpg. You can check this file using the following command:
$ sudo gpg --keyring /etc/apt/trusted.gpg --default-key D92ACBA0 --verify checksum-sha1-all.gpg checksum-sha1-all
You will need to have installed the package with the DoudouLinux repository key before hand, its name is doudoulinux-keyring. This supposes that you are running Debian Linux or any Debian derivative.
 Of course you can use foreign language versions for yourself too!
 One of them didn’t start the flash card, the other one started it but boot failed right in the middle…
 Files that would have been corrupted due to a technical problem or voluntarily after a computer pirate intrusion.
 that would have modified both the ISO image and the checksum in order to make them match
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