Ok, I have removed the snapshot and the free expected space is here, thank you!
As a side note: apt-btrfs-snapshot was not installed, but it is
present in Ubuntu repository and I have used it (and I like the idea
of automatic snapshot during upgrade)
This means that the do-release-upgrade does it's own job on BTRFS,
silently which I believe is not good from the usability perspective,
just google it, there is no mention of this behaviour
Il giorno mar 28 ago 2018 alle ore 19:07 Austin S. Hemmelgarn
<ahferro...@gmail.com> ha scritto:
>
> On 2018-08-28 12:05, Noah Massey wrote:
> > On Tue, Aug 28, 2018 at 11:47 AM Austin S. Hemmelgarn
> > <ahferro...@gmail.com> wrote:
> >>
> >> On 2018-08-28 11:27, Noah Massey wrote:
> >>> On Tue, Aug 28, 2018 at 10:59 AM Menion <men...@gmail.com> wrote:
> >>>>
> >>>> [sudo] password for menion:
> >>>> ID gen top level path
> >>>> -- --- --------- ----
> >>>> 257 600627 5 <FS_TREE>/@
> >>>> 258 600626 5 <FS_TREE>/@home
> >>>> 296 599489 5
> >>>> <FS_TREE>/@apt-snapshot-release-upgrade-bionic-2018-08-27_15:29:55
> >>>> 297 599489 5
> >>>> <FS_TREE>/@apt-snapshot-release-upgrade-bionic-2018-08-27_15:30:08
> >>>> 298 599489 5
> >>>> <FS_TREE>/@apt-snapshot-release-upgrade-bionic-2018-08-27_15:33:30
> >>>>
> >>>> So, there are snapshots, right? The time stamp is when I have launched
> >>>> do-release-upgrade, but it didn't ask anything about snapshot, neither
> >>>> I asked for it.
> >>>
> >>> This is an Ubuntu thing
> >>> `apt show apt-btrfs-snapshot`
> >>> which "will create a btrfs snapshot of the root filesystem each time
> >>> that apt installs/removes/upgrades a software package."
> >> Not Ubuntu, Debian. It's just that Ubuntu installs and configures the
> >> package by default, while Debian does not.
> >
> > Ubuntu also maintains the package, and I did not find it in Debian
> > repositories.
> > I think it's also worth mentioning that these snapshots were created
> > by the do-release-upgrade script using the package directly, not as a
> > result of the apt configuration. Meaning if you do not want a snapshot
> > taken prior to upgrade, you have to remove the apt-btrfs-snapshot
> > package prior to running the upgrade script. You cannot just update
> > /etc/apt/apt.conf.d/80-btrfs-snapshot
> Hmm... I could have sworn that it was in the Debian repositories.
>
> That said, it's kind of stupid that the snapshot is not trivially
> optional for a release upgrade. Yes, that's where it's arguably the
> most important, but it's still kind of stupid to have to remove a
> package to get rid of that behavior and then reinstall it again afterwards.
