Category: Ubuntu

Helping a friend

During the past two weeks, I've helped my friend to do several things. Two weeks ago, she asked me to reduce the size of some scanned documents in pdf format to only 50-200 kb, while still being readable. I found out that I can use Ghostscript to compress the files (thanks to Jorge) using the … Continue reading Helping a friend

Advertisements

Fixing GPG and ‘Duplicate Sources’ Errors

Here's a confession: I haven't installed any updates on my Ubuntu for a few months. The Software Updater still notified me of updated softwares, but I couldn't install them. Whenever I chose to install the updates, or even download anything from the Software Center, it would tell me that it 'requires installation of untrusted packages'. … Continue reading Fixing GPG and ‘Duplicate Sources’ Errors