Eigentlich sollte ich bei einer bewährten Methode bleiben, DVD runter laden und damit von MGA4 nach MGA5 wechseln. Aber ich dachte mir: "Versuch macht kluch" und habe die grafische Methode, die als blau-weißer Pfeil in der Taskleiste angeboten wird, gewählt.
Vorgang lief anstandslos durch, aber beim erneuten booten...

Die letzte Zeile im Startbildschirm war:
- Code: Alles auswählen
[OK] Started Update UTPM about System Runlevel Changes
Also habe ich zum heutigen Frühstück mein "kleines Knopperchen" ausgepackt um an /var/log/boot.log heran zu kommen:
- Code: Alles auswählen
?%G?%G
Welcome to ?[1;36mMageia 5?[0m!
[?[32m OK ?[0m] Reached target RPC Port Mapper.
[?[32m OK ?[0m] Reached target Login Prompts.
[?[32m OK ?[0m] Reached target Remote File Systems.
[?[32m OK ?[0m] Reached target Encrypted Volumes.
[?[32m OK ?[0m] Set up automount Arbitrary Executable File Formats File System Automount Point.
Expecting device dev-disk-by\x2duuid-1dfc07ea...\x2d48e2\x2d9bdf\x2d5e0e8dcf22a2.device...
Expecting device dev-disk-by\x2duuid-3a34c063...\x2d40b9\x2d8450\x2d212dd85c6624.device...
Expecting device dev-disk-by\x2duuid-240c27dc...\x2d4658\x2d97b2\x2ddb670e145956.device...
Expecting device dev-disk-by\x2duuid-4A9065C175608C7E.device...
Expecting device dev-disk-by\x2duuid-325898CD58989169.device...
Expecting device dev-disk-by\x2duuid-0C18B3BC18B3A35E.device...
[?[32m OK ?[0m] Created slice Root Slice.
[?[32m OK ?[0m] Created slice User and Session Slice.
[?[32m OK ?[0m] Listening on /dev/initctl Compatibility Named Pipe.
[?[32m OK ?[0m] Listening on Delayed Shutdown Socket.
[?[32m OK ?[0m] Listening on Journal Socket (/dev/log).
[?[32m OK ?[0m] Listening on udev Kernel Socket.
[?[32m OK ?[0m] Listening on udev Control Socket.
[?[32m OK ?[0m] Listening on Journal Socket.
[?[32m OK ?[0m] Created slice System Slice.
[?[32m OK ?[0m] Created slice system-getty.slice.
[?[32m OK ?[0m] Created slice system-systemd\x2dfsck.slice.
Mounting Temporary Directory...
Starting Remount Root and Kernel File Systems...
Starting Load legacy module configuration...
Mounting POSIX Message Queue File System...
Mounting Huge Pages File System...
Starting Create list of required static device nodes for the current kernel...
Starting Setup Virtual Console...
Mounting Debug File System...
?%G Starting Load Kernel Modules...
Starting udev Coldplug all Devices...
Starting Journal Service...
[?[32m OK ?[0m] Reached target Slices.
[?[32m OK ?[0m] Mounted Huge Pages File System.
[?[32m OK ?[0m] Mounted POSIX Message Queue File System.
[?[32m OK ?[0m] Mounted Temporary Directory.
[?[32m OK ?[0m] Started Remount Root and Kernel File Systems.
[?[32m OK ?[0m] Started Create list of required static device nodes for the current kernel.
[?[32m OK ?[0m] Started Setup Virtual Console.
[?[32m OK ?[0m] Mounted Debug File System.
Starting Create Static Device Nodes in /dev...
Starting Configure read-only root support...
[?[32m OK ?[0m] Started Load Kernel Modules.
Starting Apply Kernel Variables...
[?[32m OK ?[0m] Started udev Coldplug all Devices.
Starting Show Plymouth Boot Screen...
Starting udev Wait for Complete Device Initialization...
[?[32m OK ?[0m] Started Apply Kernel Variables.
[?[32m OK ?[0m] Started Create Static Device Nodes in /dev.
Starting udev Kernel Device Manager...
[?[32m OK ?[0m] Reached target Local File Systems (Pre).
[?[32m OK ?[0m] Started Show Plymouth Boot Screen.
[?[32m OK ?[0m] Started Configure read-only root support.
Starting Load/Save Random Seed...
[?[32m OK ?[0m] Started Load/Save Random Seed.
[?[1;31mFAILED?[0m] Failed to start Load legacy module configuration.
See "systemctl status fedora-loadmodules.service" for details.
[?[32m OK ?[0m] Started udev Kernel Device Manager.
[?[32m OK ?[0m] Started Journal Service.
Starting Trigger Flushing of Journal to Persistent Storage...
[?[32m OK ?[0m] Started Trigger Flushing of Journal to Persistent Storage.
[?[32m OK ?[0m] Found device SAMSUNG_HD753LJ win_3.
Mounting /media/win_c2...
?%G[?[32m OK ?[0m] Found device SanDisk_SDSSDP128G win_c.
Mounting /media/win_c3...
[?[32m OK ?[0m] Reached target Sound Card.
[?[32m OK ?[0m] Mounted /media/win_c3.
Mounting FUSE Control File System...
[?[32m OK ?[0m] Mounted FUSE Control File System.
[?[32m OK ?[0m] Found device Hitachi_HDS723020BLE640 /heim/user.
Starting File System Check on /dev/disk/by-uuid/3a34c063-6b30-40b9-8450-212dd85c6624...
[?[32m OK ?[0m] Found device Hitachi_HDS723020BLE640 swap.
Activating swap /dev/disk/by-uuid/1dfc07ea-62f8-48e2-9bdf-5e0e8dcf22a2...
[?[32m OK ?[0m] Found device Hitachi_HDS723020BLE640 /heim.
Starting File System Check on /dev/disk/by-uuid/240c27dc-6442-4658-97b2-db670e145956...
[?[32m OK ?[0m] Found device Hitachi_HDS723020BLE640 win_d.
Mounting /media/win_c...
[?[32m OK ?[0m] Activated swap /dev/disk/by-uuid/1dfc07ea-62f8-48e2-9bdf-5e0e8dcf22a2.
[?[32m OK ?[0m] Reached target Swap.
[?[32m OK ?[0m] Mounted /media/win_c2.
[?[32m OK ?[0m] Mounted /media/win_c.
[ 7.451198] systemd-fsck[658]: /heim/user: clean, 2440/51208192 files, 153181351/204800628 blocks
[?[32m OK ?[0m] Started File System Check on /dev/disk/by-uuid/3a34c063-6b30-40b9-8450-212dd85c6624.
[?[32m OK ?[0m] Started udev Wait for Complete Device Initialization.
Starting Wait for storage scan...
[ 7.863103] systemd-fsck[662]: /heim: clean, 126055/51208192 files, 171633427/204800628 blocks
[?[32m OK ?[0m] Started Wait for storage scan.
[?[32m OK ?[0m] Started File System Check on /dev/disk/by-uuid/240c27dc-6442-4658-97b2-db670e145956.
Mounting /home...
[?[32m OK ?[0m] Mounted /home.
Mounting /home/usr...
[?[32m OK ?[0m] Mounted /home/usr.
[?[32m OK ?[0m] Reached target Local File Systems.
Starting Create Volatile Files and Directories...
Starting Tell Plymouth To Write Out Runtime Data...
Starting Save boot dmesg content...
Starting Reconfigure the system on administrator request...
[?[32m OK ?[0m] Started Create Volatile Files and Directories.
Starting Update UTMP about System Boot/Shutdown...
[?[32m OK ?[0m] Started Save boot dmesg content.
[?[32m OK ?[0m] Started Update UTMP about System Boot/Shutdown.
netprofile wird gestartet: The default is the current profile.
?[85G[?[1;32m OK ?[0;39m]
nvidia-current (346.72-1.mga5.nonfree): Already installed on this kernel.
[?[32m OK ?[0m] Started Tell Plymouth To Write Out Runtime Data.
[?[32m OK ?[0m] Reached target System Initialization.
[?[32m OK ?[0m] Reached target Paths.
[?[32m OK ?[0m] Listening on CUPS Scheduler.
[?[32m OK ?[0m] Listening on PC/SC Smart Card Daemon Activation Socket.
[?[32m OK ?[0m] Listening on Avahi mDNS/DNS-SD Stack Activation Socket.
[?[32m OK ?[0m] Listening on D-Bus System Message Bus Socket.
[?[32m OK ?[0m] Reached target Sockets.
[?[32m OK ?[0m] Reached target Timers.
Starting Manage Sound Card State (restore and store)...
[?[32m OK ?[0m] Started Manage Sound Card State (restore and store).
virtualbox (4.3.28-1.mga5): Already installed on this kernel.
Suche neue Hardware-Komponenten ?[85G[?[1;32m OK ?[0;39m]
[?[32m OK ?[0m] Started Reconfigure the system on administrator request.
[?[32m OK ?[0m] Reached target Basic System.
Starting Disk Manager (legacy version)...
Starting Daemon for power management...
Starting Configure CPU power related settings...
Starting Adapt Mageia theme to the monitor resolution...
Starting ACPI Event Daemon...
Starting Shorewall IPv6 firewall...
Starting NTP client/server...
Starting Job spooling tools...
[?[32m OK ?[0m] Started Job spooling tools.
Starting Login Service...
Starting LSB: Nameserver information manager...
Starting CUPS Scheduler...
Starting Avahi mDNS/DNS-SD Stack...
Starting D-Bus System Message Bus...
[?[32m OK ?[0m] Started D-Bus System Message Bus.
[?[32m OK ?[0m] Started Daemon for power management.
[?[32m OK ?[0m] Started Avahi mDNS/DNS-SD Stack.
[?[32m OK ?[0m] Started Disk Manager (legacy version).
Starting iptables Firewall for IPv4...
Starting ip6tables Firewall for IPv6...
Starting Permit User Sessions...
[?[32m OK ?[0m] Started Configure CPU power related settings.
[?[32m OK ?[0m] Started ACPI Event Daemon.
[?[32m OK ?[0m] Started Permit User Sessions.
[?[32m OK ?[0m] Started NTP client/server.
[?[32m OK ?[0m] Started iptables Firewall for IPv4.
[?[32m OK ?[0m] Started Login Service.
Starting Authorization Manager...
Starting Command Scheduler...
[?[32m OK ?[0m] Started Command Scheduler.
Starting Wait for Plymouth Boot Screen to Quit...
Starting Display Manager...
[?[32m OK ?[0m] Started Display Manager.
[?[32m OK ?[0m] Started ip6tables Firewall for IPv6.
Starting Manage, Install and Generate Color Profiles...
[?[32m OK ?[0m] Started Adapt Mageia theme to the monitor resolution.
[?[32m OK ?[0m] Started Manage, Install and Generate Color Profiles.
[?[32m OK ?[0m] Started Authorization Manager.
[?[32m OK ?[0m] Started LSB: Nameserver information manager.
Starting LSB: Bring up/down networking...
[?[32m OK ?[0m] Started CUPS Scheduler.
Starting Make remote CUPS printers available locally...
[?[32m OK ?[0m] Started Make remote CUPS printers available locally.
[?[32m OK ?[0m] Started LSB: Bring up/down networking.
Starting irqbalance daemon...
[?[32m OK ?[0m] Started irqbalance daemon.
Starting LSB: Enables MSEC security policy on boot...
Starting LSB: Checks if a partition is close to full up...
[?[32m OK ?[0m] Started LSB: Enables MSEC security policy on boot.
[?[32m OK ?[0m] Started LSB: Checks if a partition is close to full up.
Starting LSB: Locks NumLock key at init runlevel change...
[?[32m OK ?[0m] Started LSB: Locks NumLock key at init runlevel change.
Starting LSB: VirtualBox Linux kernel module...

Die Suche "Kernel modul für Virtualbox verhindert den Start von Linux" war kein Treffer.
Gruß
J.