Category: About computer

sudo apt install ubuntu-unity-desktop fails from scratch. Fix it by sudo apt-get install dbus-x11  

Alt+Super+S turns orca on/off

A quick workaround. Install synaptics and reboot sudo apt install xserver-xorg-input-synaptics then synclient VertScrollDelta=-111    Autoload the configuration   Add a file 20-natural-scrolling-touchpads.conf under /usr/share/X11/xorg.conf.d with the following content Section “InputClass” Identifier “Natural Scrolling Touchpads” MatchIsTouchpad “on” MatchDevicePath “/dev/input/event*” Option “VertScrollDelta” “-111” Option “HorizScrollDelta” “-111” EndSection  

Try to press right Ctrl and your keyboard will be fully functional in remote computer. You will be able to use Alt+Tab.

sklearn is not sklearn If you came across complaint no module named sklearn and you are sure that you “installed” that with pip install sklearn. Sorry, sklearn is scikit-learn instead of sklearn. pip install scikit-learn should solve the problem. Dropbox is syncing all files except some Check if you own the file. It maybe belong…

A simple hack to import a module from another folder   import sys # caution: path[0] is reserved for script path (or ” in REPL) sys.path.insert(1, ‘/path/to/application/app/folder’) import file    

This is a very misleading and weird error. When running aws configure in ubuntu 20.04. If I copied and pasted the key id and secret to the terminal, it appends something like ^[[200~ and ^[[201~ before and after the copied key and secret. I was not aware of what that was then but it seems…

Google passwords failed me again. I got “can’t load this page” error. I didn’t know that password is also saved in chrome. One can retrieve that at setting->autofill

I tried to use Qt designer, and I don’t see how I can rename a slot in the designer. It turns out that it will try to “connect by the name” directly.  It is quite obscure. And here is a bit of explanation.

Somehow using installing ros seems to screw up PKG_CONFIG_PATH and it returns only /opt/ros/noetic/lib/pkgconfig And if I try gst-inspect-1.0 It will return almost nothing. Manage to find the path back with pkg-config –variable pc_path pkg-config So adding export PKG_CONFIG_PATH=`pkg-config –variable pc_path pkg-config`:$PKG_CONFIG_PATH to .bashrc will do the trick. Now gst-launch-1.0 playbin uri=file:///path/to/video will play video…