Often when we try to install any software in elementary os using the terminal commands like the following:
wget -O- https://apt.releases.hashicorp.com/gpg | gpg --dearmor | sudo tee /usr/share/keyrings/hashicorp-archive-keyring.gpg echo "deb [signed-by=/usr/share/keyrings/hashicorp-archive-keyring.gpg] https://apt.releases.hashicorp.com $(lsb_release -cs) main" | sudo tee /etc/apt/sources.list.d/hashicorp.list sudo apt update && sudo apt install vagrant The script looks for a valid ubuntu version by executing lsb_release -cs. And it will return code name of elementary os but not the ubuntu code name. But what is required is ubuntu code name. The following script does not exactly solve the issue. But it is handy to fetch the ubuntu code and replace it where needed.
# Reads the /etc/os-release file and reads the file into a dictionary named os_release. # Please read https://unix.stackexchange.com/a/433245/298979 to understand why sourcing and awk are poor ideas to replicate the same in those methods. if test -r /etc/os-release then declare -A os_release while IFS="\=" read -r key value do os_release[$key]=$value done < /etc/os-release alias uc="echo ${os_release[UBUNTU_CODENAME]}" #Get ubuntu code name else echo "Unable to read /etc/os-release file to get ubuntu code" fi 
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