Loic, your problem is not the same as the original report. In your situation, 
this is due to a corrupted installation script. You can workaround it by 
following the steps below:
Open a terminal and run
sudo rm /var/lib/dpkg/info/bcmwl-kernel-source.{postinst,prerm,postrm}
sudo apt-get remove --purge bcmwl-kernel-source
sudo apt-get clean

Repeat for each failing package with the error "Exec format error"
Then try performing the installation again.

For your reference you can find information about installation issues at
https://wiki.ubuntu.com/DebuggingInstallationIssues

Hope this helps.

-- 
package bcmwl-kernel-source 5.10.91.9+bdcom-0ubuntu4 failed to install/upgrade: 
package bcmwl-kernel-source is already installed and configured
https://bugs.launchpad.net/bugs/479912
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