Klaus Knopper answers your Linux questions
Ask Klaus

Klaus Knopper answers your Linux questions
BIOS Reaction
Klaus: I purchased an HP Notebook 15 AMD. The BIOS was corrupted soon after. Here is how various distros reacted with secure boot and UEFI disabled:
- Mint – Installed okay with a fuzzy screen appearing in the bootup process. The error message said "the hardware acceleration is disabled and this mode should only be used for troubleshooting." I could use the OS. Mint did not allow me to
su
to root. - Fedora – The install process crashed when a notice appeared saying KVM is disabled.
- Tisquel – The install was successful, but it reported that I was not root during the install process and tried to fix the problem. I never saw the message again.
- Yet Another Distro – Reported that the SMBIOS was disabled and crashed.
- Mageia – Crashed during install.
- Korora – Reported the KVM message and crashed during install.
With secure boot and UEFI enabled, Windows 8 booted up okay and reported nothing. I have tried flashing the BIOS, but it is blocked using the HP BIOS tool from Windows and Wine.
Can you advise on any fix? I would advise that the developers merge all their error trapping with better advice on the significance of the error message.
Thanks, R
The "KVM" and "SMBIOS" messages are somewhat confusing, as they suggest that you did not boot Linux natively on the HP notebook but used virtualization, or the distro in question just wrongly detects some kind of virtualization and tries to load the corresponding acceleration modules.
Does your computer maybe run some kind of hypervisor from the UEFI firmware, instead of loading operating systems natively? Also, the fact that various distros crash during install may lead to the conclusion that the real hardware is not accessible because of a hypervisor restricting access (not really related to "root," but could be mistaken as missing privileges by installation programs).
If this is the case, there is no simple way to let any Linux distro show a verbose message like "I'm not running natively on this computer, but under a simulation," because from the viewpoint of the OS, there is no difference between a simulated or a real computer.
If, as you say, flashing the BIOS is also impossible using the vendors' own tools, it also indicates that an intermediate software layer is running that blocks access to the real hardware. On the other hand, if the BIOS is defective, it may just give the impression that a hypervisor is blocking hardware access, and it may be the BIOS itself that does this. In either case, a pure software solution of the problem may be unlikely.
You could try to turn in the notebook as a warranty case and get a replacement with an unrestricted BIOS that allows you to boot all operating systems you choose.
Filesystem Repair
Dear Klaus, a little time ago I unplugged a USB extension drive without thinking and without unmounting the drive when the SUSE system indicated that my backup had finished, despite knowing that I should never do this. The backup disk will not mount anymore, and despite all attempts to find an answer, all I have [left] is to try ScanDisk on a Windows computer. Is this really the only answer?
Yours sincerely, Terry
Instead of the very limited ScanDisk, why not use the native filesystem repair tools that come with most Linux distros?
For FAT32 filesystems, you can use dosfsck, for ext2, use e2fsck, and for NTFS, just use ntfs-3g to repair the filesystem.
If your backup disk displays as /dev/sdb1
(cat /proc/partitions
), see Table 1 for the commands for repairing the filesystems. Please do not attempt these commands on filesystems that are already mounted, even though the tools are usually clever enough to warn and quit in this case.
Table 1
Commands for Repairing Filesystems
Filesystem Type | Command for Interactive Repair |
---|---|
FAT32 |
|
Ext2/3/4 |
|
NTFS |
|
ReiserFS |
|
Other |
|
If the filesystem is not repairable this way, or if the partition table is corrupt (in which case ScanDisk would also fail), you may try the excellent testdisk
utility on the disk device (/dev/sdb
in this example) to identify and repair partitions interactively and to salvage data from them.
If your Linux distro requires root access for accessing block devices, prefix each command with sudo
to gain root access for the duration of the operation.
Wine Menu, Please
Klaus, I'm trying to create my own Linux distribution that uses LXDE as its desktop and is based on Debian Stable. I noticed with Knoppix 7.4 that when logged into LXDE, you created a "Wine" menu that goes a total of four levels deep. I'm trying to do the same thing in order to provide menu entries for scripts that make it easy to install other programs that there's no room for on the CD (I'm also trying to keep the ISO size to 700MB or less, for those without access to a DVD burner).
I've followed a tutorial I found online for how to do this, but in spite of trying it multiple times and doing everything exactly as shown, I keep leaving myself with just the "Run" and "Logout" options in the menu; that's obviously not what I want, and it's driving me up the wall. Could you please tell me how you did it?
Thanx in advance, Fred in St. Louis
Actually, I didn't create the Wine menu personally, but the Wine package (like some others) adds its own menu structure and manages it via user-defined configuration files, and this is done even if you install Windows programs via the "Windows" installer under Wine, not using Debian's standard installation tools.
You can create menu entries manually, though. I'd recommend NOT messing with the XML-based menu configuration system (/etc/menu-methods/*
, /etc/xdg/menus/*
, …) that is used by the update-menus
utility, but just copy a freedesktop.org-compatible .desktop
file to the appropriate directory beneath the .local/share/applications
(hidden) directory on your default users home directory.
Listing 1 shows the contents of .local/share/applications/wine/Programs/Java-Editor/Java-Editor.desktop
after installing the program under Wine.
Listing 1
Contents of .desktop
As you can see, the submenus follow the directory hierarchy starting from .local/share/applications
, and menu content and start program are determined by the .desktop
file's content. Figure 1 shows the resulting menu in Knoppix 7.5.
Klaus Knopper
Klaus Knopper is an engineer, creator of Knoppix, and co-founder of LinuxTag expo. He works as a regular professor at the University of Applied Sciences, Kaiserslautern, Germany. If you have a configuration problem, or if you just want to learn more about how Linux works, send your questions to: klaus@linux-magazine.com
Buy this article as PDF
(incl. VAT)
Buy Linux Magazine
Direct Download
Read full article as PDF:
Price $2.95
Subscribe to our Linux Newsletters
Find Linux and Open Source Jobs
Subscribe to our ADMIN Newsletters
Find SysAdmin Jobs
News
-
OpenMandriva Lx 23.03 Rolling Release is Now Available
OpenMandriva "ROME" is the latest point update for the rolling release Linux distribution and offers the latest updates for a number of important applications and tools.
-
CarbonOS: A New Linux Distro with a Focus on User Experience
CarbonOS is a brand new, built-from-scratch Linux distribution that uses the Gnome desktop and has a special feature that makes it appealing to all types of users.
-
Kubuntu Focus Announces XE Gen 2 Linux Laptop
Another Kubuntu-based laptop has arrived to be your next ultra-portable powerhouse with a Linux heart.
-
MNT Seeks Financial Backing for New Seven-Inch Linux Laptop
MNT Pocket Reform is a tiny laptop that is modular, upgradable, recyclable, reusable, and ships with Debian Linux.
-
Ubuntu Flatpak Remix Adds Flatpak Support Preinstalled
If you're looking for a version of Ubuntu that includes Flatpak support out of the box, there's one clear option.
-
Gnome 44 Release Candidate Now Available
The Gnome 44 release candidate has officially arrived and adds a few changes into the mix.
-
Flathub Vying to Become the Standard Linux App Store
If the Flathub team has any say in the matter, their product will become the default tool for installing Linux apps in 2023.
-
Debian 12 to Ship with KDE Plasma 5.27
The Debian development team has shifted to the latest version of KDE for their testing branch.
-
Planet Computers Launches ARM-based Linux Desktop PCs
The firm that originally released a line of mobile keyboards has taken a different direction and has developed a new line of out-of-the-box mini Linux desktop computers.
-
Ubuntu No Longer Shipping with Flatpak
In a move that probably won’t come as a shock to many, Ubuntu and all of its official spins will no longer ship with Flatpak installed.