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…
Stop an instance and detach the volume Attach the volume to another instance Mount the volume with commands below sudo mkdir -m 000 /vol sudo mount /dev/xvdf1 /vol -t ext4
Played a little bit of Bricklink Studio. I have to say that it is a very nice app. Unfortunately, it only works natively in Windows and Macs. I tried to use VirtualBox with it. But it is painfully slow. And adding more core doesn’t help. I have an 8-core laptop and adding 4 cores doesn’t…
I was following turtlebot tutorial but it can’t find the package somehow. source ~/catkin_ws/devel/setup.bash does not solve the problem. But it turns out starting fresh by creating a new workspace seems to resolve the problem.
Motion is great simple software for surveillance application. And it can be easily install in Ubuntu with apt install. It is a command line based software. It doesn’t have some fancy GUI, but the setup is quite easy. The default config file is stored as /etc/motion/motion.conf. One would like to create a .motion directory in…
Find a site called Resurchify that ranks journal papers. Another site we already used quite a bit is letpub.
I should have tried to figure this out for long. It took a while but here is a nice solution. Basically just use onenote. And to record, I can use audacity and record from pulse. And can use pulse audio control (pavucontrol) to select only system sound.