It is by design that you cannot revert to a snap that you do not already
have installed on a system.
You can try using `snap list ruby --all` to get all currently installed
revisions on your system (but note that only one revision can be
"active" at a time), the revisions listed by this command are all the
revisions that you can revert to.
You can increase the number of revisions that are kept around on a
system to ensure that you are more likely to have the previous revision
available by setting the refresh.retain system setting. I believe on
Desktop/Server this setting defaults to 2, but on Ubuntu Core for
example this setting defaults to 3.
** Changed in: snapd (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1948995
Title:
Allow reverting to older revisions of a snap
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