Ubuntu Core Desktop will not be released alongside Ubuntu 24.04 LTS in April, as originally hoped.
Canonical doesn’t go into details about what specific issues need resolving. One imagines, given that the first Ubuntu Core Desktop release was going to be a preview and not a recommended download, it’s a myriad bugs/difficulties — ones not easily sorted.
Isn’t that also the case for Flatpacks?
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Oh you mean for command line applications, yes, Flatpacks cannot do that yet. Personally I manually enable Snaps in the distros I use, as some apps only exist there, but have been orienting myself where I can limit the exposure to only the packages I want.