Software rendering mode after Linux Mint update

After I did some security updates, my video display became unstable (it was showing dust when some animations were to be displayed, as if the vidao cable was incorrectly plugged), I did not really know what to do so I uninstalled the latest package installed by the security update which was named "xserver-xorg-core-lts-vivid". Then xserver stopped working...I followed some tutorial, installed some packages (as far as I remember "xserver-xorg-video-intel" and "cinnamon") and then, I could get my GUI/desktop back). However, now the system complains that it runs in "software rendering mode" and it's true the computer became slower, specially when rendering graphics. So I believe there is a problem with my driver...? I see /var/log/Xorg.0.log reports: [ 4.680] (EE) AIGLX error: Calling driver entry point failed [ 4.680] (EE) AIGLX: reverting to software rendering Here is the information I can supply right now: > sudo lshw -C video *-display description: VGA compatible controller produit: Sky Lake Integrated Graphics fabriquant: Intel Corporation identifiant matériel: 2 information bus: pci@0000:00:02.0 version: 06 bits: 64 bits horloge: 33MHz fonctionnalités: pciexpress msi pm vga_controller bus_master cap_list rom configuration: driver=i915_bpo latency=0 ressources: irq:124 mémoire:de000000-deffffff mémoire:c0000000-cfffffff portE/S:f000(taille=64) > inxi -Gx Graphics: Card: Intel Sky Lake Integrated Graphics bus-ID: 00:02.0 Display Server: X.Org 1.15.1 drivers: intel (unloaded: fbdev,vesa) Resolution: 1600x1200@60.0hz GLX Renderer: Gallium 0.4 on llvmpipe (LLVM 3.4, 256 bits) GLX Version: 2.1 Mesa 10.1.3 Direct Rendering: Yes > uname -a Linux PCJEAN 4.4.0-109-generic #132~14.04.1-Ubuntu SMP Tue Jan 9 21:46:42 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux Additionnaly: > glxinfo .... name of display: :0 libGL error: pci id for fd 4: 8086:1912, driver (null) i965_dri.so does not support the 0x1912 PCI ID. libGL error: failed to create dri screen libGL error: failed to load driver: i965 .... The "Gestionnaire de pilote" (probably "Driver manager" in English) is empty. Could there be a driver mismatch (sudo lshw -C video reports i1915, glxinfo reports i965). What operation could help xserver use my video card correctly? ------------------- Edit: After reading this post , I switched to MATE. Message saying I was in software rendering mode is gone and GUI display seems faster, however, I still see libGL error when running glxgears and still see some refresh issues with some applications.