Found in /var/crash a file _usr_bin_gnome-software.1000.crash with at the end :
Title: gnome-software crashed with signal 5 in g_main_context_new() UnreportableReason: You have some obsolete package versions installed. Please upgrade the following packages and check if the problem still occurs: gnome-software, gnome-software-common, init-system-helpers, libapparmor1, libappstream-glib8, libc6, libdrm-amdgpu1, libdrm-intel1, libdrm-nouveau2, libdrm-radeon1, libdrm2, libegl1-mesa, libfwupd1, libgbm1, libgl1-mesa-dri, libllvm3.8, libp11-kit0, libpam-systemd, libprocps4, libsystemd0, libudev1, libwayland-egl1-mesa, multiarch-support, procps, systemd, ubuntu-mono, udev UpgradeStatus: No upgrade log present (probably fresh install) _MarkForUpload: True Did sudo apt-get update sudo apt-get upgrade Rebooted and next reboot was 'clean'. Will follow-up if it remains clean -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to gnome-software in Ubuntu. https://bugs.launchpad.net/bugs/1652430 Title: gnome-software crashed with signal 5 Status in gnome-software package in Ubuntu: New Bug description: Ubuntu-software center doesn't open more than 2 seconds. ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: gnome-software 3.20.1+git20160420.1.ca63436.ubuntu-xenial-0ubuntu2 ProcVersionSignature: Ubuntu 4.4.0-57.78-generic 4.4.35 Uname: Linux 4.4.0-57-generic i686 ApportVersion: 2.20.1-0ubuntu2.4 Architecture: i386 CurrentDesktop: Unity Date: Sat Dec 24 14:36:35 2016 InstallationDate: Installed on 2016-10-15 (69 days ago) InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release i386 (20160420.1) SourcePackage: gnome-software UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-software/+bug/1652430/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp

