Installing Adobe Reader on Ubuntu

When installing RMagick you may get an error messages like this:

Version 2.13.1:

checking for Ruby version >= 1.8.5... yes
checking for gcc... yes
checking for Magick-config... no
Can't install RMagick 2.13.1...

I couldn't successfully execute a simple iptables command and got this error on an Ubuntu server:

# /sbin/iptables -I INPUT ....
iptables: No chain/target/match by that name

The cause was that two modules weren't loaded: `xt_multipor...

On some of our older projects, we use the mysql2 gem. Unfortunately, versions 0.2.x (required for Rails 2.3) and versions 0.3.x (required for Rails 3.2) can no longer be installed on Ubuntu 20.04. Trying this either leads to errors when compiling ...

With "attaching an event handler once" you possibly mean one of these two things:

Register a function for an event, and discard it once that event has happened

Use one instead of on.

$(element).one('eventName', function() { ... });

...

Google Calendar integration into Thunderbird suddenly did not work any more for me. Thunderbird kept asking me for my password to access calendars, but did not show them when given the correct credentials. Instead, calendars in the list got the fa...