Are you still using Ubuntu 19.04 'Disco Dingo'? If so suggestions please consider upgrading to version 19.10 as soon as possible. Ubuntu 19.04 released in nine months ago (ie 18 April 2019). But because it is non-LTS release, so only the official nine-month application updates and security patches.
Now nine-month period of the upcoming, official support for Ubuntu 19.04 will be terminated in 2020 January 23, after that date, if you still use it, the application will not receive any updates and bug fixes, and more It is important not to get any critical security patches.
In this regard, the official recommended upgrade path is to upgrade to 19.10 (the version released in October last year), and then wait until Ubuntu 20.04 LTS release, then upgrade to this version. Although Ubuntu 19.10 LTS is a non-version, but according to its life cycle, 19.10 receive updates and patches from official support until July 2020.
With Ubuntu 20.04 LTS plans to release in April, if we can upgrade to 19.10 20.04 to ensure that when we can publish a smooth upgrade to the new version, and can continue to receive technical support from the authorities.