This is an annoyed issue, but after several tries, here is my approach for the fix:
sudo dpkg --configure --force-overwrite -a # or sudo apt -o Dpkg::Options::="--force-overwrite" --fix-broken install
Lubuntu
Install Mongodb on Ubuntu
Command line to install mongoDB on Ubuntu
sudo apt-get install gnupg wget -qO - https://www.mongodb.org/static/pgp/server-4.4.asc | sudo apt-key add - echo "deb [ arch=amd64,arm64 ] https://repo.mongodb.org/apt/ubuntu focal/mongodb-org/4.4 multiverse" | sudo tee /etc/apt/sources.list.d/mongodb-org-4.4.list sudo apt-get update sudo apt-get install -y mongodb-org sudo systemctl start mongod sudo systemctl enable mongod
Cannot store MySQL workbench password on Ubuntu
If you’re facing this issue especially if using Kubuntu or Lubuntu: The name org.freedesktop.secrets was not provided by any .service files
You can fix it by installing this software:
sudo apt install gnome-keyring
Ubuntu Zoom Virtual Background without physical green screen
Virtual background in zoom is indeed a great feature, but unfortunately it doesn’t work on Ubuntu without a physical or real green screen. So here are some steps and commands you could run and make it work. (I use this on Ubuntu 20.04 but basically it should work for Lubuntu, LinuxMint, Debian or other systems as well as everything is via docker)
First install docker if you haven’t got it on your system already: https://leftsidemonitor.com/install-docker-and-docker-compose-on-linux/
Then run the following commands to install some required libraries
sudo apt install v4l2loopback-dkms; sudo modprobe -r v4l2loopback; sudo modprobe v4l2loopback devices=1 video_nr=20 card_label="v4l2loopback" exclusive_caps=1;
Now let’s clone this repo: https://github.com/leftsidemonitor/ubuntu-zoom-virtual-background, and run everything via docker
# Clone git clone https://github.com/leftsidemonitor/ubuntu-zoom-virtual-background.git ~/ubuntu-zoom-virtual-background cd ~/ubuntu-zoom-virtual-background cp docker_defaults.env .env docker-compose up &;
When you don’t want to use the webcam anymore, let’s stop it
cd ~/ubuntu-zoom-virtual-background; docker-compose down &;
Let’s also add some aliases some next time you can run and stop this much faster as well
# add to ~/.bashrc or ~/.zshrc alias fakecam='sudo modprobe -r v4l2loopback;sudo modprobe v4l2loopback devices=1 video_nr=20 card_label="v4l2loopback" exclusive_caps=1;cd ~/ubuntu-zoom-virtual-background; docker-compose up &;' alias stopcam='cd ~/ubuntu-zoom-virtual-background; docker-compose down &;'
That’s it, let us know if you manage to get it working in Zoom and other video calling software as well.
Fix snap application is missing on menu
If you’re using Lubuntu or switch from Gnome to KDE Plasma, chances are your apps installed by using snap / or Ubuntu store are missing. The following single command will help bring them back
# Link all shortcuts installed by snap to .local/share/applications, that's it! ln -s /var/lib/snapd/desktop/applications/* ~/.local/share/applications
How to create swap file on Ubuntu
Normally a 2GB should be enough for swap on Ubuntu, the following commands will help you create that, but you can also make change to fit your need.
sudo swapoff -a # turn off current swap so it can be updated sudo fallocate -l 2G /swapfile # create a /swapfile of 2GB, if you want 16GB just change this number sudo chmod 600 /swapfile # change write permission sudo mkswap /swapfile # make the file as swap sudo swapon /swapfile # finally add it to swap config
Then you also need to edit this file /etc/fstab as following for swap section:
/swapfile swap swap defaults 0 0
How to set login screen avatar on Lubuntu 20.04
Lubuntu is a lightweight and great operating system, unfortunately it doesn’t include a default theme that is easy for changing the default avatar. I found the following trick that might help.
First, let’s find a favorite photo that you want to set up as an avatar, then use one of the website like this to convert the photo into an icon (.ico) file: https://icoconvert.com/
Don’t worry for the .ico, it’s not a very low favicon.ico you often see. Next we need to copy this file to the following location: /usr/share/sddm/faces/ with the name like YOUR_NAME.face.icon, with YOUR_NAME is your linux login. And that’s it, you can then restart your computer for a check.
# please change YOUR_NAME and avatar.ico according to your local sudo cp Downloads/avatar.ico /usr/share/sddm/faces/YOUR_NAME.face.icon reboot