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extract tar.gz ubuntu terminal

tar -xvf yourfile.tar.gz

extract tar.gz in linux

tar –xvzf documents.tar.gz

extract tar.gz Ubuntu terminal

cd ~/Downloads/archive.tar.gz #first navigate to file location
tar -xzvf archive.tar.gz -C /path/to/new/directory/ 
#-C flag will change the extraction to a new directory.
#remove -C if you want to extract it to current location.