Following command helped me.

Remove current version:

sudo apt-get purge maven

Download the latest version:

wget https://dlcdn.apache.org/maven/maven-3/3.8.6/binaries/apache-maven-3.8.6-bin.tar.gz
tar -xvf apache-maven-3.8.6-bin.tar.gz

Installation:

sudo cp -r apache-maven-3.8.6 /opt
export PATH=/opt/apache-maven-3.8.6/bin:$PATH
echo -e "\nPATH=\"/opt/apache-maven-3.8.6/bin:\$PATH\"" >> ~/.profile

Script

#!/bin/sh

version=version ] ; then echo "specify version" ; exit 1 ; fi

#Remove old maven
sudo apt-get purge maven -y

url="https://dlcdn.apache.org/maven/maven-3/${version}/binaries/apache-maven-${version}-bin.tar.gz"
echo $url
wget $url

sleep .4

tarFile="apache-maven-${version}-bin.tar.gz"
echo $tarFile
sudo tar -xvf $tarFile -C /opt/

export PATH=/opt/apache-maven-${version}/bin:$PATH
echo -e "\nPATH=\"/opt/apache-maven-${version}/bin:\$PATH\"" >> ~/.profile

Pass the 1st argument as the maven version. Example: ./install.sh 3.8.7

Note: Make sure Java is installed before following the above steps.

Had a similar issue on 11.10, this is how I solved it:

1. Install Maven2 from Synaptic rather than downloading it from the website.
2. gedit ~/.bashrc and check if you have M2_HOME and M2 env variables defined if so DELETE them, delete them from PATH too, if there is a reference to them.
3. Reload bash and trymvn --version again.