This was an error that I encountered
E: Malformed entry 1 in list file /etc/apt/sources.list.d/docker.list (Suite)
E: The list of sources could not be read.

I wrote the following commands:

Step 1: sudo apt update
Step 2: sudo apt upgrade
Step 3 : sudo install -m 0755 -d /etc/apt/keyrings
Step 4: sudo curl  -fsSl https://download.docker.com/linux/ubuntu/gpg | sudo gpg --dearmor -o /etc/apt/keyrings/docker.gpg
Step 5: sudo chmod a+r /etc/apt/keyrings/docker.gpg
Step 6: echo "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.gpg] https://download.docker.com/linux/ubuntu  
"$(. /etc/os-release && echo "$VERSION_CODENAME")" stable" |sudo tee /etc/apt/sources.list.d/docker.list > /dev/null
This command ran properly without any error
Step 7: sudo apt update
After step 7 I encountered the error 
E: Malformed entry 1 in list file /etc/apt/sources.list.d/docker.list (Suite)
E: The list of sources could not be read.