How can I find the version number of an installed package via dpkg?

dpkg -s <packagename> | grep '^Version:'

e. g.:

dpkg -s network-manager | grep '^Version:'

Sample output:

Version: 0.8.1+git.20100810t184654.ab580f4-0ubuntu2

dpkg-query --showformat='${Version}' --show python3-lxml

It's not using the dpkg command but apt-show-versions Install banshee

Example:

$ apt-show-versions network-manager  
network-manager/maverick uptodate 0.8.1+git.20100810t184654.ab580f4-0ubuntu2

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