Title photo
frugal technology, simple living and guerrilla large-appliance repair

Regular blog here, 'microblog' there

Many of my traditional blog post live on this site, but a great majority of my social-style posts can be found on my much-busier microbloging site at updates.passthejoe.net. It's busier because my BlogPoster "microblogging" script generates short, Twitter-style posts from the Linux or Windows (or anywhere you can run Ruby with too many Gems) command line, uploads them to the web server and send them out on my Twitter and Mastodon feeds.

I used to post to this blog via scripts and Unix/Linux utilities (curl and Unison) that helped me mirror the files locally and on the server. Since this site recently moved hosts, none of that is set up. I'm just using SFTP and SSH to write posts and manage the site.

Disqus comments are not live just yet because I'm not sure about what I'm going to do for the domain on this site. I'll probably restore the old domain at first just to have some continuity, but for now I like using the "free" domain from this site's new host, NearlyFreeSpeech.net.

Mon, 17 Apr 2017

How to 'hold' a package in Ubuntu and prevent it from being updated

I am using the unison in Ubuntu 14.04 (Unison 2.40) in my Windows Subsystem for Linux-supplied Ubuntu 16.04 (which updated the package to Unison 2.48) because my server is running Unison 2.40, and I forgot that an apt upgrade will replace the .deb I downloaded from the 14.04 repository with whatever is in 16.04.

When I tried to do a unison sync, I got an error.

How do you put a package "on hold" in Ubuntu? It's easy.

First I removed the "new" unison:

$ sudo apt remove unison

Then I installed my "old" one (which I had previously downloaded from the Ubuntu archive):

$ sudo dpkg -i unison_2.40.102-2ubuntu1_amd64.deb

Now I put the package "on hold":

$ sudo apt-mark hold unison

That's it.

Here is the output now for sudo apt update:

$ sudo apt upgrade
[sudo] password for steven:
Reading package lists... Done
[sudo] password for steven:
Reading package lists... Done
Building dependency tree
Reading state information... Done
Calculating upgrade... Done
The following packages have been kept back:
  unison
0 upgraded, 0 newly installed, 0 to remove and 1 not upgraded.