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If for some reason your grub has gotten corrupted, here are the steps to restore it.

Boot into a rescue CD (either Ubuntu or System Rescue CD, which you can download freely).

Mount the drive, where sdXY is the partition (eg: /dev/sda1)

apache server

Q. I am getting a Forbidden 403 error after I've changed the DocumentRoot in Apache for my domain. What do I do?

A. This is a security feature on the Apache running on Ubuntu (and Debian). The solution is quite simple:

centosThe widely used ifconfig is missing from Centos 7.X version of Linux with minimal install. To get it back, run the following command:

yum install net-tools

The command will then be available as usual.

If you don't want to use ifconfig and are wondering how else you can find the IP address, you can run this command:

ip link

Due to some corruption issue during ubuntu (and ubuntu based sytems), this error may come up:

apt: relocation error: /usr/lib/x86_64-linux-gnu/libapt-private.so.0.0: symbol _ZN9pkgSystem9LockInnerEv, version APTPKG_5.0 not defined in file libapt-pkg.so.5.0 with link time reference

There's no clear answer on how to fix this or why it happens, but it corrupts the file libapt-private.so.0.0.0. One way to resolve the issue is to copy the file from another ubuntu 16.04 install. (Or you can download it from here: libapt-private.so.0.0.0 version x64)

Linux IT SupportSometimes it is a good idea to schedule a regular reboots, to clear the memory and remove any crashed processes.

This can be easily achieved by adding the task to a cron tab (Linux scheduling system):

First, open the crontab (as a root):

crontab -e

and add a line similar to this: