Linux Troubleshooting Archives - GNULinuxClub — Systems, Linux and Database Notes

Recover or Reinstall the GRUB Bootloader

September 29, 2026October 14, 2010 by admin

If GRUB is overwritten or removed after installing another operating system, you can usually restore it from a Linux live USB or CD. Boot into the live Linux environment and open a terminal. In this example, the installed Linux root partition is /dev/sda2 and GRUB will be installed to /dev/sda. Change these device names to … Read more

How to Check Directory Size in Linux Using du

September 28, 2026October 26, 2009 by

Get the space taken by directory for Linux OS/Unix The following command can be used to get the space taken by directory du -sh <path of the directory> [gaurav@home]$ du -sh /var/www/ 1.5G /var/www/

Safely Find and Delete Files in Linux with find

September 28, 2026April 20, 2009 by

This is a useful tip to find and remove some files by searching recursively in a directory and sub directories This will list down all the *.tmp/*.log files find . -type f -name "*.tmp" -exec echo {} ; find . -type f -name "*.log" -exec echo {} ; This will delete down all the *.tmp/*.log files find . … Read more

Fix Half-Duplex and Full-Duplex Network Issues in Linux

September 28, 2026May 12, 2008 by

From Half duplex to Full duplex in GNU/Linux This can be one of the reasons for slow network performance with Linux.one of the issues that I have faced was that the half duplex mode was selected with the network card and the network switch when the option of ‘auto negotiation’ was set to ON We … Read more

Change File Permissions on an FTP Server

September 28, 2026March 11, 2008 by

To chmod /change the permissions of the file on FTP server For a given scenario , if you want to change the permissions of a file placed on your FTP server, you would think of a shell access to that location so that you can issue the chmod command.But there is a way around for … Read more

Installing GRUB : rescue mode

August 23, 2018February 18, 2008 by

During rescue mode, there can be problems with grub-installation if we are not able to ‘chroot’ in the correct OS environment. so, if the rescue mode of a Linux OS allows you to run grub from the command line, then installing grub can be done like this grub-install /dev/sda –root-directory=/mnt/boot for this, MBR is on … Read more

Linux File Permissions

September 28, 2026February 23, 2006 by

When you try to run a file it may refuse to work with an error like “Permission denied” and when you try to view another file it may also say that you don’t have permission to view it. These all come down to file permissions, a basic feature of Unix. There are 3 types of … Read more

Can’t mount root fs

August 23, 2018November 3, 2005 by

When you boot a system, this is an error that will halt the system. This error means that the kernel can’t
mount the root file system, so it can’t get all of its configuration files.
There are a few cases where this happens:
· No IDE support in the kernel. If your main hard drive is an IDE, and you have recompiled
without including “Enhanced IDE/MFM/RLL disk/cdrom/tape/floppy support” or some other
basic IDE device drivers.
· File system not supported. Usually the root file system should be of type ext2. You need to
make sure that ext2 is compiled in the kernel, and not as a module because you can’t load
modules without first mounting the root file system.
· The drive is not ready. If you have removed the drive, the hard disk died or the BIOS didn’t
detect the device for some reason, then the kernel won’t be able to mount it.

Resizing and defragmenting Linux filesystems

August 23, 2018October 19, 2005 by admin

Resizing and defragmenting Linux filesystems follow here http://www.newsforge.com/os/03/10/07/2028234.shtml

Recover files from Linux filesystem

August 23, 2018July 24, 2005 by admin

Recovering files from the Linux filesystem can be done using many software as well as inbuilt tools in Gnu/Linux R-Linux this is for recovering files from ext2fs filesystem recover project This is the genral methos for recovering files from all filesystems