The snap system includes a background service named snapd which is responsible for refreshing installed snaps based on the channels that they are tracking. By default, snapd performs refresh operations at regular intervals (typically four times a day). To identify when the last refresh was performed and the next is due, run the following command:
# snap refresh --time
timer: 00:00~24:00/4
last: today at 07:23 EDT
next: today at 14:25 EDT
The above output also includes timer information which indicates that the refresh will be performed four times within each 24 hour period:
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timer: 00:00~24:00/4
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The snap command can also be used to force a refresh of all installed snap packages as follows:
# snap refresh
Alternatively, to refresh a specific package:
# snap refresh remmina
To switch a package to a different channel without having to wait for the next snapd service refresh, simply run the snap refresh command...