I'm (still) on Debian Squeeze. When I try to upgrade the system, here's what I get:[09:20]/root# aptitude upgradeNo packages will be installed, upgraded, or removed.0 packages upgraded, 0 newly installed, 0 to remove and 1 not upgraded.Need to get 0 B of archives. After unpacking 0 B will be used.Looking at the log, I get a hint at the name of the culprit package:Aptitude 0.6.3: log reportSat, Jun 22 2013 09:20:13 +0200IMPORTANT: this log only lists intended actions; actions which fail due todpkg problems may not be completed.Will install 0 packages, and remove 0 packages.===============================================================================[HOLD] libxcb1===============================================================================Log complete.However, if I look at the package, I don't get any more details:[09:21]/root# aptitude show libxcb1Package: libxcb1State: installedAutomatically installed: noVersion: 1.6-1Priority: optionalSection: libsMaintainer: XCB Developers <xcb@lists.freedesktop.org>Uncompressed Size: 188 kDepends: libc6 (>= 2.3.2), libxau6, libxdmcp6Breaks: libxcb-xlib0...I'm surprised by how little info aptitude is giving me about its refusal to upgrade the package.My question is: What are the steps I should follow in this situation to find out why this package is not upgraded?Update: Here's the desired command:$ apt-cache policy libxcb1libxcb1:  Installed: 1.6-1  Candidate: 1.6-1+squeeze1  Version table:     1.6-1+squeeze1 0        500 http://security.debian.org/ squeeze/updates/main amd64 Packages *** 1.6-1 0        500 http://debian.mirrors.ovh.net/debian/ squeeze/main amd64 Packages        100 /var/lib/dpkg/status
How to deal with a package not upgraded using aptitude?
debian;apt;aptitude