@Charly: Try to upgrade your initscripts package first and then upgrade the brltty package. This worked for me
-- You received this bug notification because you are a member of Desktop Packages, which is subscribed to brltty in Ubuntu. https://bugs.launchpad.net/bugs/1365054 Title: package brltty 5.0-2ubuntu3 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1 Status in “brltty” package in Ubuntu: Confirmed Bug description: /usr/bin/dpkg returned an error code (1) upgrade from 14.04 to 14.10 ProblemType: Package DistroRelease: Ubuntu 14.10 Package: brltty 5.0-2ubuntu3 ProcVersionSignature: Ubuntu 3.13.0-34.60-generic 3.13.11.4 Uname: Linux 3.13.0-34-generic i686 ApportVersion: 2.14.1-0ubuntu3.3 AptOrdering: brltty: Configure Architecture: i386 Date: Wed Sep 3 12:06:13 2014 DuplicateSignature: package:brltty:5.0-2ubuntu3:subprocess installed post-installation script returned error exit status 1 ErrorMessage: subprocess installed post-installation script returned error exit status 1 InstallationDate: Installed on 2014-08-13 (21 days ago) InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release i386 (20140417) SourcePackage: brltty Title: package brltty 5.0-2ubuntu3 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1 UpgradeStatus: Upgraded to utopic on 2014-09-03 (0 days ago) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/brltty/+bug/1365054/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp