Ubuntu 15.10: blurry texts and images

I’m all new to Linux systems environment, therefore as Ubuntu itself — I’m using the 15.10 “Wily Werewolf” version —, and I’ve already searched a lot on the internet, in this, and several other forums, for answers to this particular issue, and none of them were helpful, or were just specific for some graphic cards, and always non-generic answers. What I’m looking for is an all-cases solution, independing on the user’s graphic card, if possible. That would be more helpful not just for me, but also for other users who may are experiencing the same issue, I think.

The problem consists in a blur in the texts and images inside Ubuntu folders and directories and internet browsers, in all folders and files names, websites addresses, PHP and HTML sites texts in general, it looks like the fonts are corrupted, or something like that. Sometimes constant and very intense, like a pixelation effect, that distorts the words and doesn’t allow me to see/read absolutely nothing, and sometimes it’s less strong, and just appear when I pass the mouse cursor through a specific text or image, then it becomes slightly blurry. I’m not very sure about this, but I noticed that the blur effect sometimes becomes stronger when the CPU and memory is in high usage, when I have multiple things open up, for example.

Here’s an image with the blur effect (slighter, at this time) in some textboxes inside Ubuntu keyboard settings:

In advance, two notes: ¹yes, I’ve already updated my graphic card’s drivers, directly downloading the latest version for it right on the manufacturer’s official website, and ²yes, I’ve checked the ideal resolution for my screen, it’s 1920 x 1080 pixels, 16:9 aspect ratio (I’m using a LG Flatron E2240, if useful).

Do anyone know a fix for this issue?

My PC hardware basic details and configuration, according directly to Ubuntu “System Setting > All Settings > Details”:

• Processor: Intel® Core™2 CPU 6300 @ 1.86GHz × 2
• Graphics: Intel® G33
• Memory: 2,9 GiB
• OS type: 64-bit
• Disk: 26,3 GB

Not a very good or fast PC, I know, but that’s all I have, ha ha.

If some additional info is required to help me find a solution for this issue, just reply to this question and I’ll find it out and then put it here as fast as possible.

I’m Brazilian, therefore a portuguese native speaker, so I’m sorry for any grammatical mistakes on my part.

I really don’t know more what to do. Always wanted to migrate to a Linux system distribution, and everyone adviced me to star with Ubuntu, but I just can’t continue trying it with this problem, being a visual and thus a very disturbing one.

fonts-dejavu-core
fonts-khmeros-core
ttf-ancient-fonts-symbola
ttf-dejavu-core
ttf-indic-fonts-core
ttf-ubuntu-font-family

$ strace -o unity-control-center.strace -s 8192 -f unity-control-center
$ grep open( unity-control-center.strace  | grep ttf | sed -e 's;^.*(";;' -e 's;".*$;;' | xargs dpkg -S | awk -F: '{print $1}' | sort -u