How to check an Ubuntu .iso file

After downloading an .iso file from ubuntu.com (please tick the box under the “Start Download” green button if you want the alternate version and choose a mirror close to your location), you need to verify that the .iso file is not corrupted before you can use it to install Ubuntu.

Ubuntu provides the md5 hashes of all the released .iso files. Please read here for more information about md5 (Message-Digest algorithm 5). To check the file, we’ll use md5sum.

  • md5sum on the downloaded file
    Go to the directory the file is located and run md5sum. In the example below, I had downloaded the file to the desktop:

    :~ $cd Desktop/
    :~/Desktop $ md5sum ubuntu-7.10-alternate-i386.iso 
    9a4ae3cfd68911a861d094ec834c9b48  ubuntu-7.10-alternate-i386.iso

    Then verify it matches the hash from the Ubuntu release.

  • md5sum on the burnt file
    Once you have burnt the .iso file to a CD, it is a good idea to check it too, and verify nothing happened during the process. By default, Ubuntu mounts the cdrom to /media:

    :~ $ cd /media/cdrom0/
    :/media/cdrom0 $ md5sum -c md5sum.txt | grep -v 'OK$'
    :/media/cdrom0 $ 

    If the match is good, there will be no error on the output.

You can then use the disk to install Ubuntu :)

Reference

Shamelessly inspired from the Ubuntu Community Documentation page. Please refer to this page if you are downloading and burning the .iso file on Windows.

wubdepends, get Ubuntu packages for an off line machine

I ran into wubdepends in a UF thread.
christhemonkey has written a utility in python that allows to download a package from the ubuntu repositories, along with all its dependencies.

Many people around the world have problems getting online at home, or have trouble setting up a connection, and I see requests to get packages off line quite often on UF. I have not tested wubdepends, but I really like the idea. There is a .exe for windows, interesting if the only internet access point is on a Windows machine.

References

Sourceforge Project
Screenshots
Downloads

Blog split

After much pondering, I’ve decided to copy my articles in French to a new blog, where I’ll be resuming posting in French. I had dropped writing French articles because it was a pain to have double entries on this blog. Several persons were unhappy about it, but I never took the time to set up something else.
Nothing will change for the RSS feeds on PUU for ex, as I’ll keep writing occasional entries not suited for the Planet and the current set up works fine. This blog will be English-only from now on.

So here it is, for the ones interested: http://bapoumba2fr.wordpress.com/.
I kept the same layout, I just like it for now.

/me feels better :D

A new Community OpenOffice.org forum

This was posted today on the OpenOffice announce mailing-list –> Linky to the new forum.

From the ml announcement:

This new Forum goes beyond being simply a knowledge base of questions and answers and is rather a place for OpenOffice.org users to interact freely with each other.

I see Hagar de l’Est (Salut JN ;)) is already there. Welcome and happy life :)
The OpenOffice forums in French are here.

Malicious commands that can compromize a Linux system

Following up on a previous entry and on K.Mandla’s article, here is a link to a Sotfpedia article by Marius Nestor, inspired by the announcement jdong posted on the Ubuntu forums.
Edit 071203: How did I miss Aysiu’s post

Once again, information and education of the new users is the best answer we can offer, in addition to some adapted moderation rules and actions on the forums that will be discussed during our next Forum Council Meeting (date and time to be set up).

In the mean time, many thanks to the numerous UF members who have changed their signature to warn new users, reported malicious entries and quickly posted warnings in the attacked threads :)

Lettre hebdomadaire Ubuntu 67 du 18 au 24 novembre 2007

Au sommaire :

  • Chaque étudiant macédonien utilisera Ubuntu
  • MOTU
  • Azureus est réparé
  • Nouvelles de Launchpad
  • Nouvelles des forums Ubuntu
  • Revue de presse
  • Dans la blogosphère
  • Réunions et évènements
  • Mises à jour et mises à jour de sécurité
  • Statistiques concernant les bugs et les traductions

L’article complet est sur le wiki et le blog.

Openoffice.org 2.3 color palette

You can add custom colors with > Tools > Options > Openoffice.org > Colors.
In this process, OOo crashed down on me this morning (I’m running Gutsy and using OOo from Ubuntu repos). It would run again, reopen the files, but all the color palette for text or objects was gone gone gone:
screenshot_ooo_cropped.png

A purge/reinstall with aptitude did not help.

Thanks to my friends from the “Linux On The Roots” mailing list (see the link under “Linux” category, web site in French), I could get the palette back in my user folder. The ~/.openoffice.org2/user/config/standard.soc was empty… I just copied back /usr/lib/openoffice/presets/config/standard.soc in my ~/.openoffice.org2/user/config/ file.

Hmm. Not the first time around an app closes down on me emptying some config files. Last time, it was the Xfce panels. Gremlins?

Xfce Compositing Manager and password windows for root graphical applications

Several Ubuntu Xfce users have reported a delay when root graphical applications (ie launched with gksudo or gksu) ask for the password. The windows hang for several seconds, up to 40. I’ve noticed that even the clock stops ticking.

This bug is probably related to Xfce compositing manager, in particular the shadows under the popups.
The current workaround is to disable “Display shadows under popup windows” or launch the application with gksudo -g.

man gksudo
--disable-grab, -g
Disable the "locking" of the keyboard, mouse,
    and focus done by the program when asking for password.

Edit 071124:
From the UF thread (see below), run gksu-properties and disable capture-mode. I’ve looked around, but does anyone have more infos about this workaround?

References

UF thread
LP bug report
Xfce bugzilla report

UbuntuHQ

I have been reading UbuntuHQ for a while now, after I found an incoming link in my dashboard :)
They have a nice collection of Tutorials and Tips, application reviews and news related to Ubuntu. You can browse the Howtos section here. They are a community site, meaning you can register and submit articles.

I’ve added their RSS feed to my blogroll, please feel free to subscribe to their feed, lots of good stuff :)

(Side note: nice blog theme too ;-D).