Ubuntu 18.04 LTS takes 10min+ to boot

[Marco_Ros]

Hello
I have installed UBUNTU 18.04 in my computer, only to notice that it takes more than 10 minutes to boot.
while loading, there are the following messages onscreen

[drm:drm_atomic_helper_wait_for_flip_done [drm_kms_helper]] *ERROR* [crtc:34:PIPE a] flip_done timed out
[drm:drm_atomic_helper_wait_for_dependencies [drm_kms_helper]] *ERROR* [crtc:34:PIPE a] flip_done timed out
(showed only some of them)

Also, after system is up and running, everytime I open CONFIGURATION, it takes about 2 minutes, white all my system appears as stalled (it accepts no input)), until configuration panel shows up.

I'm sure all this has something to do with the errors at start-up

How can this problem be diagnosed an corrected?

Acer Aspire 2920 Laptop
UBUNTU 18.04 LTS
RAM: 4GB
Intel® Core™2 Duo CPU T7300 @ 2.00GHz × 2
GRAPHICS:Intel® 965GM
OS TYPE: 64 bits

[deadflowr]

Duplicate thread.
See other here: https://ubuntuforums.org/showthread.php?t=2407325
Please don't post multiple threads on the same issue.
This thread is now closed.