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Old

Removing accumulated old Linux kernels

Posted 01-17-2017 at 04:28 PM by flshope
Updated 01-17-2017 at 09:31 PM by flshope (fix typos, add clarification)

I have a 2008 HP 2133 Mininote PC, which is a small laptop machine. It has a 32-bit VIA C7-M Processor running at 1200 MHz. The memory is 2 GB and the single hard disk is 120 GB.

I originally purchased it with a vendor-installed SUSE distribution. I later installed Ubuntu 12.04 LTS. The machine is now at 14.04.5 LTS. I generally do weekly software updates as provided by Ubuntu.

Over the years, the machine gradually accumulated a lot of old Linux kernels, and it began...
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Views 84 Comments 0 flshope is offline
Old

Command-line control of network activation and deactivation

Posted 12-12-2016 at 01:33 PM by flshope

It took me a while to find this, so I thought I would post it. After searching through various sources, I finally took the time to read all of the hundred or so lines you get from 'apropos network'.

A terminal command to activate or deactive networking is

Code:
nmcli networking on
nmcli networking off
Under Ubuntu I usually depend on a networking control icon that appears on the tool bar of the indicator applet, but sometimes the icon is missing. I...
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Views 180 Comments 0 flshope is offline
Old

Ubuntu OS upgrades usually degrade function on older machines

Posted 10-29-2016 at 09:07 PM by flshope
Updated 12-15-2016 at 07:37 PM by flshope (Add to list of Ubuntu 16.04 anomalies)

I have two machines running Ubuntu, one a 5-year old Pogo Linux desktop ("Pogo2011" running Ubuntu 16.04 LTS) and the other an 8-year old HP notebook ("HP2008" running Ubuntu 14.04). To date, I have gone through 10 Ubuntu installs or major version upgrades (including 4 on a 2003 Pogo Linux desktop, which I finally moved to Debian to keep it alive ("Pogo2003" running Debian 8.6)).

It has been my experience that Ubuntu OS upgrades do not generally produce...
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Old

Gnuplot aborts Ubuntu 16.04 LTS upgrade installer

Posted 09-16-2016 at 02:02 PM by flshope

A week ago I decided to proceed with the upgrade from Ubuntu 14.04 LTS to 16.04 LTS. I always dread having to do these upgrades because it always means trouble, and this one was no exception.

As instructed by the release notes

https://wiki.ubuntu.com/XenialXerus/ReleaseNotes

I started from the Update Manager, which offers the LTS upgrade once it has been made available three or four months after the initial release in April. I have made it a practice...
Attached Images
File Type: png Screenshot from 2016-09-09 10:03:50.png (34.3 KB, 1 views)
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Old

Emacs rectangle search/replace

Posted 08-21-2016 at 08:43 PM by flshope

I use Emacs to write code occasionally, mostly Fortran. A common thing I need to do is search and replace everywhere in a region confined to a rectangle within the text. An example is altering an existing code from Fortran 77 format to Fortran 90, specifically changing all of the Cs in column one (indicating comments) to !s. In Emacs terminology, this is a rectangle of width 1 character and as high as the number of lines in the code.

I have had difficulty figuring out how to do this...
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