Comment 2 for bug 1590989

Here's a more concise and clear example:

ev@elsa:~/jenkins-snap$ snap install jenkins
96.67 MB / 96.67 MB [====================================================] 100.00 % 6.99 MB/s

Name Version Rev Developer
jenkins 2.8 4 ev
ev@elsa:~/jenkins-snap$ snap refresh --channel=edge jenkins
96.66 MB / 96.66 MB [====================================================] 100.00 % 6.30 MB/s

Name Version Rev Developer
jenkins 2.9-SNAPSHOT 5 ev
ev@elsa:~/jenkins-snap$ snap refresh --channel=stable jenkins

error: cannot perform the following tasks:
- Download snap "jenkins" from channel "stable" (revision 4 of snap "jenkins" already installed)