Install latest/stable of graylog
Ubuntu 16.04 or later?
Make sure snap support is enabled in your Desktop store.
Graylog is a full-featured log management system allowing for centralized management, processing and alerting on logs from applications and systems.
At a miniumum update the configuration at /var/snap/graylog/common/server.conf to set the admin password and mongodb connection string. Connection information for elastic search is also needed, refer to the Graylog documentation.
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Choose your Linux distribution to get detailed installation instructions. If yours is not shown, get more details on the installing snapd documentation.