Unable to install software manually from a .deb file

Hello everyone,

I am tying to install Dayon! (an open-source and cross-platform (JAVA) solution that allows watching and controlling a remote computer) from https://github.com/retgal/dayon/releases.

I have downloaded a .deb file from here, verified the md5sum and opened the Tilix terminal. I get the next message:

snailmail@snailmail-pc:~/Downloads$ sudo dpkg -i dayon*.deb
(Reading database … 205512 files and directories currently installed.)
Preparing to unpack dayon_1.10.1_all.deb …
Unpacking dayon (20200405112122) over (20200405112122) …
dpkg: dependency problems prevent configuration of dayon:
dayon depends on default-jre (>= 2:1.8-58); however:
Package default-jre is not installed.

dpkg: error processing package dayon (–install):
dependency problems - leaving unconfigured
Errors were encountered while processing:

I am using PureOS 9, updated it today.

Kindly help, Snailmail

Did you try “sudo apt install default-jre”?