Tag Archives: ubuntu

ERROR: could not open extension control file “/usr/share/postgresql/9.3/extension/plr.control”: No such file or directory

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Problem

You are trying to install the PL/R extension to PostgreSQL, after install R in your linux ubuntu development environment, but when trying to install the extension inside your PostgresSQL with:

create extension plr;

you are getting the following error:

ERROR:  could not open extension control file "/usr/share/postgresql/9.3/extension/plr.control": No such file or directory

Solution

Install the necessary package for your PostgreSQL version with the following, and install the extension in your psql:

sudo apt-get install postgresql-9.x-plr

Docker error – error response from daemon: Cannot start container….is not within /var/lib/docker/aufs/mnt

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Problem

You are trying to use an image from Docker in your Ubuntu 14.04 system, but you are getting a error like the following:

014/12/13 17:10:23 Error response from daemon: Cannot start container 4023610855c0551bdc44d0e602f20999c0527da3cfe010169707248887b3a1f0: /var/lib/docker/aufs/mnt/4023610855c0551bdc44d0e602f20999c0527da3cfe010169707248887b3a1f0 is not within /var/lib/docker/aufs/mnt/4023610855c0551bdc44d0e602f20999c0527da3cfe010169707248887b3a1f0

Solution

Your docker version is outdated (ie 1.0.1) so you would need to upgrade your docker installation.
There is a script for this (information from here):

After running the following you should be able to use your images as normal with: sudo docker run -t -i image/name bin/bash:

$ curl -s https://get.docker.io/ubuntu/ | sudo sh

Project ERROR: Unknown module(s) in QT: webkitwidgets

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Problem

You are trying to bundle install a Gemfile that includes the capybara-webkit gem, in an Ubuntu system but you get the following error:

ERROR:  Error installing capybara-webkit:
ERROR: Failed to build gem native extension.
Project ERROR: Unknown module(s) in QT: webkitwidgets

Solution

It seems that the latest ubuntu versions are using QT version 5 instead of 4. So in order to be able to install the gem you would need to install the qt development libraries for version 5 like:

sudo apt-get install libqt5webkit5-dev

Using Postfix to send out emails from development environment in Rails

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Problem

You want to be able to send emails from your development enironment using Postfix in your (K)Ubuntu pc.

Solution

First you would need to install postfix:

sudo apt-get install postfix

and then you would need to change an option in postfix to not use tls, so change /etc/postfix/main.cf:

sudo vi /etc/postfix/main.cf

and change the smtpd_use_tls from yes to no:

smtpd_use_tls=no

restart your postfix server:

sudo /usr/sbin/postfix reload

and then setup your config/development.rb as follows:

config.action_mailer.delivery_method = :smtp
config.action_mailer.smtp_settings = {
  address:                 "127.0.0.1",
  port:                    25,
  enable_starttls_auto:    false
}

Command line mail message with postfix in (K)ubuntu

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Problem

You have installed postfix in your local development machine (sudo apt-get install postfix), and you want to test sending emails from the command line using mail email_address@someone.com

 

Solution

You would first need to install the mailutils package:

sudo apt-get install mailutils

then you can send an email by:

mail email_name@example.com
CC: (leave blank)
Subject: Test subject
Main message body

and you can send it by pressing Ctrl+D