Database files are incompatible with server (updating inside Linode)

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I went through steps to update Ubuntu and finally pressed on this.

The image is a screenshot of a terminal showing an error message about the obsolete PostgreSQL version 9.5 and instructions on how to upgrade. (Captioned by AI)
The image is a screenshot of a terminal showing an error message about the obsolete PostgreSQL version 9.5 and instructions on how to upgrade. (Captioned by AI)784×496 12.1 KB

But the screen has locked up at
The image displays the outputs of package installation processes on a Linux system, showing various packages being set up and installed, including systemd, mimeme-support, libxslt, xorg-driver-generic, libcap-ng1-dev, dbus-client, and PostgreSQL. (Captioned by AI)
The image displays the outputs of package installation processes on a Linux system, showing various packages being set up and installed, including systemd, mimeme-support, libxslt, xorg-driver-generic, libcap-ng1-dev, dbus-client, and PostgreSQL. (Captioned by AI)797×423 10.3 KB

Re connecting I see I have Ubuntu 18.0.4.6 LTS (Bionic Beaver)