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Ubuntu

Ubuntu Linux

Unable to enumerate USB device on port…

I have an old PC with what appears to be a broken implementation of USB. I cannot obtain a BIOS update and there is no BIOS setting to switch off USB either. Very old Linux distributions would run on this PC, but only on those with USB support as loadable modules. For later kernels with […]

What to do with an OldWorld Mac?

During our recent house move I found my old and dusty PowerMac 8500/180 while we were packing up the contents of my garage. It had been placed on the bottom shelf of my car spares shelving for a time when I could either make a VGA adapter cable or acquire another old Mac monitor to […]

Installing Zoneminder on Ubuntu 11.04

I have been experimenting with Zoneminder recently, using the pre-built package for Ubuntu 11.04. I couldn’t get the package to work properly but found some very useful instructions in the Zoneminder Wiki that made it work. When I finish the installation I will put this into an install script.    

Find BIOS version using Ubuntu

I found this really simple way of finding the installed BIOS version on an Ubuntu PC without having to reboot. Simply execute the following command in a terminal session and scroll through the output until you find the BIOS section. sudo dmidecode -s bios-version For more system information, just scroll through the output until you […]

Ubuntu 10.10 SSH login message fix

Do you get two welcome messages when logging in to your Ubuntu 10.10 host? I have experienced it on hosts upgraded from 10.04 and on freshly built hosts from the downloaded CD-ROM images. The problem can be easily fixed using… sudo rm /etc/motd.tail If you are still using password based login for SSH, consider using […]

Securing the list of last logged in users

The command ‘last‘ lists the times and dates of successful logins. The command ‘lastb‘ lists unsuccessful attempts. I found that both unnecessarily had public read access on most of my Ubuntu servers. Two log files provide the data used by last and lastb. Both can be secured by changing the permission to 660. sudo ls […]

Restricting access to ftpd

Whether the ftp daemon is in use or not on a Linux host, it’s a good idea to restrict the system user accounts from using it. Any user ID that is in /etc/passwd that is not permitted to use ftp should be copied to /etc/ftpusers. The following commands for Ubuntu create the file with a […]

Wireshark missing interfaces on Ubuntu 10.10

The old Dell laptop that I use for packet sniffing was in need of a rebuild after I had been experimenting with Zabbix. In hindsight, I shouldn’t have used the laptop that has become my network toolkit. I had well and truly messed it up and I was desperate to get it operational again. Ubuntu […]

Scheduling automatic updates to save money

I had an unlimited download account with my previous Internet Service Provider and I never worried about what time of day I would download a CD-ROM ISO or system update. However, since changing to PlusNet I am now on a 60GB per month download limit as unlimited accounts are now a thing of the past. […]

Wireshark missing interfaces on Ubuntu 10.04

I have been using Wireshark for some time on my Vista laptop but I couldn’t get it to work on my smaller Ubuntu laptop. When an update was installed today for Wireshark on my Windows machine I decided that now was the time to fix the problem on my old Ubuntu laptop. It was a […]