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Bartosz Meglicki bmegli

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bmegli / route_A_through_B_to_C.md
Created March 17, 2024 13:18
route traffic from A over B network interfaces to C

Scenario

# B has 2 network interaces, A reachable through one, C reachable through other
# We want A to C communiation (over B)
A----B----C

Ad-hoc solution

@bmegli
bmegli / gpd-win2-with-ubuntu-20-04-MATE.md
Last active February 12, 2024 22:30
GPD WIN2 with Ubuntu 20.04 MATE

Tested with Ubuntu MATE 20.04 LTS Daily Build (21.03.2020)

  1. Download image
  2. Create bootable USB with Startup Disk Creator
  3. Boot GPD Win2 with Del to enter BIOS
  4. Navigate to Save & Exit and select your USB device
  5. Install & Reboot
  6. Clone and apply UMPC hardware configuration for Ubuntu



  


  




    


          
    

      

        
        

          

              @bmegli
          

          

            
                bmegli
                / CMake_3_20_Ubuntu_18_04.md
            
            

              Last active
              January 30, 2024 07:32
            

              
                CMake 3.20 in Ubuntu 18.04 (reversible way)
              
          

        

      

        

  

      

    
Motivatation


    

  • modern CMake is required for building a lot of new software
    • 

  • CMake is dependency for many packages (e.g. ROS related)
    • 

  • we don't want to remove CMake (which would remove packages that depend on it)
    • 

  • we want safe procedure to update CMake that can be reversed easily
    • 



Current version in OS


Check current version



  


  




    


          
    

      

        
        

          

              @bmegli
          

          

            
                bmegli
                / ubuntu_unnatended_upgrade_state.md
            
            

              Created
              August 18, 2023 10:45
            

              
                Ubuntu unnatended upgrade state (`Waiting for cache lock...`)
              
          

        

      

        

  

      

    
Checking Status


# check service status
sudo systemctl status unattended-upgrades


# check service log
journalctl --unit unattended-upgrades



  


  




    


          
    

      

        
        

          

              @bmegli
          

          

            
                bmegli
                / ffmpeg_record.md
            
            

              Created
              January 3, 2023 13:39
            

              
                FFmpeg script for capturing desktop
              
          

        

      

        

  

      

    
cat record.sh


set -x
ffmpeg -video_size 1920x1080 -framerate 30 -f x11grab -draw_mouse 0 -i :1 -c:v libx264 -crf 0 -preset ultrafast ~/Videos/$1



  


  




    


          
    

      

        
        

          

              @bmegli
          

          

            
                bmegli
                / cmake_gcc_gpp_version.md
            
            

              Created
              April 6, 2022 12:53
            

              
                CMake with certain gcc/g++ version
              
          

        

      

        

  

      

    
# e.g for gcc-6 and g++-6
export CC=/usr/bin/gcc-6
export CXX=/usr/bin/g++-6
cmake ..
make -j8



  


  




    


          
    

      

        
        

          

              @bmegli
          

          

            
                bmegli
                / Ubuntu18_04_libgcc_s_so_1_recovery.md
            
            

              Created
              February 8, 2022 11:16
            

              
                Ubuntu 18.04 how to recover from libgcc_s.so.1 dissaster
              
          

        

      

        

  

      

    
Motivation


When:


    

  • using newer compilers from Ubuntu test ppa (e.g. ppa:ubuntu-toolchain-r/test)
    • 

  • ppa-purge later to revert the system to clean state
    • 



it is possible to get to dissastrous state where libgcc_s.so.1 is misssing.


In such state apt and other applications may not work and system will not boot.



  


  




    


          
    

      

        
        

          

              @bmegli
          

          

            
                bmegli
                / MoveGitTagToCommit.md
            
            

              Created
              February 1, 2022 09:36
            

              
                Moving git tag to different commit
              
          

        

      

        

  

      

    
git tag -d <tagname>                  # delete the old tag locally
git push origin :refs/tags/<tagname>  # delete the old tag remotely
git tag <tagname> <commit>          # make a new tag locally
git push origin <tagname>             # push the new local tag to the remote 


Source



  


  




    


          
    

      

        
        

          

              @bmegli
          

          

            
                bmegli
                / firefox_fix_13012022.md
            
            

              Last active
              January 13, 2022 09:27
            

              
                Firefox stuck at 100% CPU no internet - fix (13.01.2022)
              
          

        

      

        

  

      

    
Looks like some "time bomb" in Firefox


To workaround:


    

  1. Open about:config
    2. 

  2. Search for https3
    3. 

  3. Disable network.http.http3.enabled
    4. 

  4. Restart Firefox
    5. 



Now re-enable network.http.http3.enabled and restart. It should be still working.



  


  




    


          
    

      

        
        

          

              @bmegli
          

          

            
                bmegli
                / vcpkg.md
            
            

              Created
              October 7, 2021 15:28
            

              
                VCPKG cheatsheat
              
          

        

      

        

  

      

    
Unninstalling Packages


# vcpkg_target_triplet is envirnoment variable with triplet name
vcpkg remove package:%vcpkg_target_triplet% --recurse


Installing Packages