OS: Ubuntu 20.04
The following is the output of
snap list on a new install of Ubuntu 20.04:
$ snap list Name Version Rev Tracking Publisher Notes core18 20200311 1705 latest/stable canonical✓ base gnome-3-34-1804 0+git.2c86692 27 latest/stable/… canonical✓ - gtk-common-themes 0.1-36-gc75f853 1506 latest/stable/… canonical✓ - snap-store 3.36.0-74-ga164ec9 433 latest/stable/… canonical✓ - snapd 2.44.3 7264 latest/stable canonical✓ snapd $
And this is what I see after installing a variety of snaps (and removing some):
$ snap list Name Version Rev Tracking Publisher Notes core 16-2.44.3 9066 latest/stable canonical✔ core core18 • 20200427 1754 latest/stable canonical✔ base firefox * 77.0b2-1 358 latest/beta mozilla✔ - gnome-3-28-1804 3.28.0-16-g27c9498.27c9498 116 latest/stable canonical✔ - gnome-3-34-1804 • 0+git.2c86692 27 latest/stable/… canonical✔ - gnome-system-monitor * 3.32.0-27-g32ed970e06 135 latest/stable canonical✔ - gtk-common-themes • 0.1-36-gc75f853 1506 latest/stable/… canonical✔ - kanagram * 20.04.0 51 latest/stable kde✔ - kcolorchooser * 20.04.0 57 latest/stable kde✔ - kde-frameworks-5 5.47.0 27 latest/stable kde✔ - kde-frameworks-5-core18 5.61.0 32 latest/stable kde✔ - kde-frameworks-5-qt-5-14-core18 5.68.0 4 latest/stable kde✔ - kolourpaint * 20.04.0 56 latest/stable kde✔ - ksnip * 1.7.0 46 latest/edge dporobic - okular * 20.04.0 98 latest/stable kde✔ - snap-store • 3.36.0-74-ga164ec9 433 latest/stable/… canonical✔ - snapd • 2.44.3 7264 latest/stable canonical✔ snapd $
For ease of discussion, let's call
- the five original snaps (tagged with
•next to their names) "system snaps"
- the snaps I knowingly installed (tagged with
*next to their names) "primary snaps"
- and the other snaps "supporting snaps"
Given that a snap and a minimum of two revisions are stored by the system, and that some supporting snaps can be a couple of hundred MB (
ls -lh /var/lib/snapd/snaps), it would be worth knowing which secondary snaps can be removed if the primary snap has been already removed.
But how does one "map" the supporting snaps to the primary snaps?
In my case, I can run
snap connections okular to intuit that
kde-frameworks-5-qt-5-14-core18 was installed as a consequence of
sudo snap install okular.
snap connections … works only if the relevant snap is still installed. I had installed but then removed
palapeli, and the stable version of
Is there a log file related to installing and removing snaps akin to
If not, how else is one to know if a "supporting" snap is still required?
A related, but unanswered, question is here: How can I list manually installed snaps and remove no longer needed automatically installed ones?