When Snap updates a program it keeps the before versions installed. For example, I had Skype installed with the 60 version ( 567 MB ),but then it was updated with 63 version (606 MB) and finally the actual 66 version ( 607 MB ). As is the program uses 1.7 GB in the hard disc. If an user has in his system a few programs installed using Snap, probably it doesn't a big problem but if the idea is that in the future the most program is istalling as is, it will use a lot of space in the hard disc, and the process won't be efficient. If I uninstall Skype and re install again, it uses only 607 MB. If this issue is not known, how can I comunicate to Ubuntu programers to review it and try to improve the process ?
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1You can avoid Snaps by installing software from APT from official and third-party repositories/PPAs. For example Skype has deb-package version. – N0rbert Dec 31 '18 at 17:14
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The developers were already discussing it long ago...and did something about it.
Your Ubuntu system, using snapd, will keep the current snap, plus two older snaps, for a total of three. Three is the default. You can reduce this to two using:
snap set system refresh.retain=N
N cannot be less than 2.
user535733
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Thanks for the answer. I read the other answer before this with this command: snap remove --revision=
snapname, and it was useful. I didn't use your command but probably is useful too. I use the other command and made the job well. – Jorge Rodríguez Jan 01 '19 at 23:57