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Ubuntu boot hangs with black screen after GRUB

It might actually not be hanged, but instead but you might have been kicked into an initramfs shell but it is not displaying on the screen. 

Try to boot in recovery mode or boot on a install CD or USB stick in rescue mode. Edit /etc/default/grub: 

vi /etc/default/grub

Set the following: 

GRUB_TERMINAL=console
GRUB_GFXPAYLOAD_LINUX=text 

If the GRUB timeout is very short it might be a good idea to set it a bit higher so you have a chance to make a selection: 

GRUB_TIMEOUT=10

Save and then execute: 

update-grub

Then reboot the machine and now you may see the emergency shell you are kicked into. Now you can investigate your boot problems further.

Ubuntu 9.10 package mysql-server-5.1 5.1.37-1ubuntu5.1 failed to install/upgrade: subprocess new pre-removal script returned error exit status 1

When trying to do an apt-get upgrade the MySQL package failed with the error message:

package mysql-server-5.1 5.1.37-1ubuntu5.1 failed to install/upgrade: subprocess new pre-removal script returned error exit status 1

The problem is that the start / stop script for MySQL fails to stop the running MySQL server before upgrade.

Solution:

apt-get update
ps ax | grep mysql

Now kill each process that has to do with MySQL.

apt-get upgrade

Voila – now it works and MySQL gets upgraded.

How to find out what Ubuntu version a system is running

There are two ways:

# cat /etc/issue
Ubuntu 9.10 \n \l

or

# lsb_release -a
Distributor ID:    Ubuntu
Description:    Ubuntu 9.10
Release:    9.10
Codename:    karmic

The latter is slower but gives more information.

Ubuntu eee: Intermittent DNS problems with Windows Vista Internet Connection Sharing (ICS)

When connecting an Asus EeePC 900/901 running Ubuntu eee 8.04 (‘Easy Peasy‘) to the Internet through a Windows Vista machine running Internet Connection Sharing (ICS) and you are experiencing intermittent DNS-problems, the problem can be related to IPv6 being enabled but there is no IPv6 Internet connection (only IPv4). In Firefox there is a DNS-error displayed, but hitting reload one or more times will bring up the desired web page. Internet access can also be experienced as slow or sluggish.

The problem can be that IPv6 is enabled in both the Windows Vista and the Ubuntu machine but there is no IPv6 Internet connection. The problem can be resolved by disabling IPv6 in Windows Vista running ICS. You can of course solve it by disabling IPv6 in the Ubuntu machine but then you have to disable it in every client inte network using the ICS, so it is more efficient to disable it in the Windows Vista running the ICS.

Instructions how to disable IPv6 in Windows Vista is found here. Don’t forget to enable it once you hook up your Windows Vista machine into an IPv6 enabled Internet connection Wink

Ubuntu eee: Youtube video problem

In Ubuntu eee 8.04 for Asus EeePC 900/901 (‘Easy Peasy‘) there is a problem when trying to look at Youtube videos. Almost all videos gives a message saying that it is not currently available.

The problem is the flash player included in the Ubuntu eee installation. To resolve the problem:

  1. Try do uninstall ‘flashplugin-nonfreebeta’ using the Synaptics package manager.
  2. Go to http://get.adobe.com/flashplayer, download and install the latest flash player for Ubuntu 8.04.
  3. Restart Firefox.

Ubuntu eee: Asus EeePC 900/901 WLAN against DLINK DI-624+ router problem

When using Ubuntu eee 8.04 (‘Easy Peasy‘) on an ASUS Eee PC 900/901 and you try to connect to a DLINK DI-624+ wireless broadband router with WEP security enabled, the network manager in Ubuntu eee keeps displaying a dialog asking for the WEP pass phrase, even though is entered correctly.

The problem is the “Super G mode” in the DLINK DI-624+. Just disable it and the EeePC will be able to connect.