Installing packages might fail due to apt unable to acquire dpkg lock

Get:168 http://security.ubuntu.com/ubuntu bionic-security/main amd64 libwww-perl all 6.31-1ubuntu0.1 [137 kB]
Get:169 http://security.ubuntu.com/ubuntu bionic-security/main amd64 python2.7-dev amd64 2.7.15-4ubuntu4~18.04.2 [276 kB]
Get:170 http://security.ubuntu.com/ubuntu bionic-security/main amd64 python3.6-dev amd64 3.6.8-1~18.04.3 [508 kB]
Preconfiguring packages ...
Fetched 150 MB in 44s (3,417 kB/s)
dpkg: error: dpkg status database is locked by another process
E: Sub-process /usr/bin/dpkg returned an error code (2)