After some days the problem disappeard 'by itself'. I did install various other programs, and at some pint in time this generic Ubuntu bug was solved.
Running the commands under #4 (from Joseph) showed that everything was ok. Thanks. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1625355 Title: package linux-image-4.4.0-38-generic 4.4.0-38.57 failed to install/upgrade: run-parts: /etc/kernel/postinst.d/zz-update-grub exited with return code 139 Status in linux package in Ubuntu: Incomplete Bug description: After upadte, system malfunction. ProblemType: Package DistroRelease: Ubuntu 16.04 Package: linux-image-4.4.0-38-generic 4.4.0-38.57 ProcVersionSignature: Ubuntu 4.4.0-36.55-generic 4.4.16 Uname: Linux 4.4.0-36-generic x86_64 ApportVersion: 2.20.1-0ubuntu2.1 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC1: tyro 1862 F.... pulseaudio /dev/snd/controlC0: tyro 1862 F.... pulseaudio Date: Mon Sep 19 22:21:17 2016 ErrorMessage: subprocess installed post-installation script returned error exit status 2 HibernationDevice: RESUME=UUID=4eef35db-0034-4ffe-926a-d9fe6efb0614 InstallationDate: Installed on 2016-09-14 (5 days ago) InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719) IwConfig: lo no wireless extensions. enp5s0 no wireless extensions. MachineType: Gigabyte Technology Co., Ltd. To be filled by O.E.M. ProcFB: 0 nouveaufb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-36-generic root=UUID=18a4e446-5c1d-4e9f-a6ed-7c139a310871 ro quiet splash vt.handoff=7 PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon. RelatedPackageVersions: grub-pc 2.02~beta2-36ubuntu3.2 RfKill: SourcePackage: linux Title: package linux-image-4.4.0-38-generic 4.4.0-38.57 failed to install/upgrade: run-parts: /etc/kernel/postinst.d/zz-update-grub exited with return code 139 UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 05/11/2012 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: F13 dmi.board.asset.tag: To be filled by O.E.M. dmi.board.name: Z77-D3H dmi.board.vendor: Gigabyte Technology Co., Ltd. dmi.board.version: To be filled by O.E.M. dmi.chassis.asset.tag: To Be Filled By O.E.M. dmi.chassis.type: 3 dmi.chassis.vendor: Gigabyte Technology Co., Ltd. dmi.chassis.version: To Be Filled By O.E.M. dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrF13:bd05/11/2012:svnGigabyteTechnologyCo.,Ltd.:pnTobefilledbyO.E.M.:pvrTobefilledbyO.E.M.:rvnGigabyteTechnologyCo.,Ltd.:rnZ77-D3H:rvrTobefilledbyO.E.M.:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvrToBeFilledByO.E.M.: dmi.product.name: To be filled by O.E.M. dmi.product.version: To be filled by O.E.M. dmi.sys.vendor: Gigabyte Technology Co., Ltd. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1625355/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp