Yauhen Yakimenka's questions

I have recently upgraded my desktop PC from Ubuntu 18.10 to 19.04. Now I am getting the following error when I try to start ̶o̶n̶e̶ ̶o̶f̶ ̶m̶y̶ ̶p̶r̶o̶g̶r̶a̶m̶s̶ Wolfram Mathematica 11.3:

symbol lookup error: /usr/lib/x86_64-linux-gnu/libfontconfig.so.1: undefined symbol: FT_Done_MM_Var

I tried to check this command:

$ ldd /usr/lib/x86_64-linux-gnu/libfontconfig.so.1
linux-vdso.so.1 (0x00007fffbd1e9000)
libfreetype.so.6 => /usr/lib/x86_64-linux-gnu/libfreetype.so.6 (0x00007f723c2e6000)
libexpat.so.1 => /lib/x86_64-linux-gnu/libexpat.so.1 (0x00007f723c2a9000)
libuuid.so.1 => /lib/x86_64-linux-gnu/libuuid.so.1 (0x00007f723c2a0000)
libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 (0x00007f723c27f000)
libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f723c094000)
libpng16.so.16 => /usr/lib/x86_64-linux-gnu/libpng16.so.16 (0x00007f723c05d000)
libz.so.1 => /lib/x86_64-linux-gnu/libz.so.1 (0x00007f723c03f000)
/lib64/ld-linux-x86-64.so.2 (0x00007f723c401000)
libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007f723bef1000)

But I am not that advanced linux user to understand what all these things mean.

Has anyone seen this problem?

Disclaimer

I know there is a couple of similar questions but all of them seem to have trouble with NVIDIA graphics. However, I have a built-in Intel graphics.

The problem

Whenever I try to open system settings, the system logs me out. After re-login, all the applications I had open are closed (i.e. this is really log-out, not just locking the screen).

Solutions I have tried

• NVIDIA drivers issues: as I said, I don't use an NVIDIA graphics card
• remove .Xauthority folder: I don't have this folder

System info

This is a desktop PC with ASRock Z390 Extreme 4 motherboard. The only external hardware connected is an external WiFi adapter.

Output of sudo inxi -SCG:

System:
  Host: mypc Kernel: 4.18.0-13-generic x86_64 bits: 64 
  Desktop: Gnome 3.30.1 Distro: Ubuntu 18.10 (Cosmic Cuttlefish) 
CPU:
  Topology: 6-Core model: Intel Core i5-9600K bits: 64 type: MCP 
  L2 cache: 9216 KiB 
  Speed: 800 MHz min/max: 800/4600 MHz Core speeds (MHz): 1: 1036 2: 873 
  3: 1265 4: 850 5: 1319 6: 1068 
Graphics:
  Device-1: Intel driver: i915 v: kernel 
  Display: x11 server: X.Org 1.20.1 driver: i915 resolution: 3840x2160~30Hz 
  OpenGL: renderer: llvmpipe (LLVM 7.0 256 bits) v: 3.3 Mesa 18.2.2 

UPD

I also tried to run gnome-control-center &> before-log-out.log and this is the contents of the file I have after having logged back in:

XIO:  fatal IO error 11 (Resource temporarily unavailable) on X server ":0"
      after 11 requests (11 known processed) with 0 events remaining.

UPD2

If I log in with Wayland, I can open settings without any problem. The output of inxi -SCG is the same with the only difference: Display: wayland.

However, on Wayland the system is much slower (even the mouse movements are noticeably irregular). This issue is posted as a separate question.

I have just recently installed Ubuntu 18.10 on my desktop. There is an issue which I can't understand: if I start a session with Wayland (choosing this while logging in), the system noticeably slower. I mean, even the mouse and typing are with a small (but noticeable) delay. If I run htop, I see that all the cores are constantly 40-50% busy, and the most CPU-hungry processes are gnome-shell.

System info

Output of inxi -SCG (v. 3.0.24-00) under Wayland:

System:
  Host: mydesktop Kernel: 4.18.0-13-generic x86_64 bits: 64 
  Desktop: Gnome 3.30.1 Distro: Ubuntu 18.10 (Cosmic Cuttlefish) 
CPU:
  Topology: 6-Core model: Intel Core i5-9600K bits: 64 type: MCP 
  L2 cache: 9216 KiB 
  Speed: 1482 MHz min/max: 800/4600 MHz Core speeds (MHz): 1: 2315 2: 2317 
  3: 2318 4: 2318 5: 2320 6: 2320 
Graphics:
  Device-1: Intel driver: i915 v: kernel 
  Display: wayland server: X.Org 1.20.1 driver: i915 
  resolution: 3840x2160~30Hz 
  OpenGL: renderer: llvmpipe (LLVM 7.0 256 bits) v: 3.3 Mesa 18.2.2

The same under X11:

System:
  Host: mydesktop Kernel: 4.18.0-13-generic x86_64 bits: 64 
  Desktop: Gnome 3.30.1 Distro: Ubuntu 18.10 (Cosmic Cuttlefish) 
CPU:
  Topology: 6-Core model: Intel Core i5-9600K bits: 64 type: MCP 
  L2 cache: 9216 KiB 
  Speed: 801 MHz min/max: 800/4600 MHz Core speeds (MHz): 1: 800 2: 800 
  3: 800 4: 800 5: 800 6: 800 
Graphics:
  Device-1: Intel driver: i915 v: kernel 
  Display: x11 server: X.Org 1.20.1 driver: i915 resolution: 3840x2160~30Hz 
  OpenGL: renderer: llvmpipe (LLVM 7.0 256 bits) v: 3.3 Mesa 18.2.2 

I have a built-in Intel graphic card, the motherboard is ASRock Z390 Extreme4.

UPD

Under X11, there is another issue though. If I try to open the system settings, I am forcefully logged out. I created a separate question about this.

Disclaimer: I am not that advanced Ubuntu/Linux user.

Where can I look into the problem in my Ubuntu? What to start with?