If when you run “wget -qO- https://get.docker.com/ | sh” command to install Docker on your Ubuntu 14.04 as described in the offical document, and met the following problem like me:

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~$ wget -qO- https://get.docker.com/ | sh
apparmor is enabled in the kernel and apparmor utils were already installed
/sbin/apparmor_parser
+ [ https://get.docker.com/ = https://get.docker.com/ ]
+ sudo -E sh -c apt-key adv --keyserver hkp://p80.pool.sks-keyservers.net:80 --recv-keys 36A1D7869245C8950F966E92D8576A8BA88D21E9
Executing: gpg --ignore-time-conflict --no-options --no-default-keyring --homedir /tmp/tmp.X1DXDZAunN --no-auto-check-trustdb --trust-model always --keyring /etc/apt/trusted.gpg --primary-keyring /etc/apt/trusted.gpg --keyserver hkp://p80.pool.sks-keyservers.net:80 --recv-keys 36A1D7869245C8950F966E92D8576A8BA88D21E9
gpg: requesting key A88D21E9 from hkp server p80.pool.sks-keyservers.net
gpgkeys: key 36A1D7869245C8950F966E92D8576A8BA88D21E9 can't be retrieved
gpg: no valid OpenPGP data found.
gpg: Total number processed: 0

you can try the alternative method in the post from here.

I was wondering if there is something in the Python world just like RVM in the Ruby world. So I get pyenv.

When I try installing “paramiko” on my local “Python3” environment with “pip”, the depended package “pycrypto” installation reports the following error:

From here, here and here.

This is a quite common problem for the VirtualBox user: after some time, you find the original image disk size is not enough and want to make it larger. How to make it?

Here is some notes about Docker I learned today.

The following error happens when I run “apt-get dist-upgrade”:

Please read the post and watch the podcast.

How to make a program run automatically on startup under Ubuntu? Read the post and the solution.

On a server we know there is a database backup process which runs twice a day but there is nothing related in the “crontab -e” text content. Why?