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55.

The portal-info command returns information about a process in keyfile format.

This command is used by the xdg-desktop-portal service to retrieve
information about snap confined processes.

56.

The prefer command enables all aliases of the given snap in preference
to conflicting aliases of other snaps whose aliases will be disabled
(or removed, for manual ones).

57.

The prepare-image command performs some of the steps necessary for
creating device images.

For core images it is not invoked directly but usually via
ubuntu-image.

For preparing classic images it supports a --classic mode

58.

The publisher of snap %q has indicated that they do not consider this revision
to be of production quality and that it is only meant for development or testing
at this point. As a consequence this snap will not refresh automatically and may
perform arbitrary system changes outside of the security sandbox snaps are
generally confined to, which may put your system at risk.

If you understand and want to proceed repeat the command including --devmode;
if instead you want to install the snap forcing it into strict confinement
repeat the command including --jailmode.

59.

The quota command shows information about a quota group, including the set of
snaps and any sub-groups it contains, as well as its resource constraints and
the current usage of those constrained resources.

60.

The quotas command shows all quota groups.

61.

The reboot command can used from allowed hooks to control the reboot behavior of the system.

Currently it can only be invoked from gadget install-device during UC20 install mode. After invoking it from install-device with --halt or --poweroff the device will not reboot into run mode after finishing install mode but will instead either halt or power off. From install-device the effect is therefore not immediate but delayed until the end of installation itself.

62.

The reboot command reboots the system into a particular mode of the selected
recovery system.

When called without a system label and without a mode it will just
trigger a regular reboot.

When called without a system label but with a mode it will use the
current system to enter the given mode.

Note that "recover", "factory-reset" and "run" modes are only available for the
current system.

63.

The recovery command lists the available recovery systems.

With --show-keys it displays recovery keys that can be used to unlock the encrypted partitions if the device-specific automatic unlocking does not work.

64.

The refresh command prints pending refreshes of the calling snap and can hold
back disruptive refreshes of other snaps, such as refreshes of the kernel or
base snaps that can trigger a restart. This command can be used from the
gate-auto-refresh hook which is only run during auto-refresh.

Snap can query pending refreshes with:
$ snapctl refresh --pending
pending: ready
channel: stable
version: 2
revision: 2
base: false
restart: false

The 'pending' flag can be "ready", "none" or "inhibited". It is set to "none"
when a snap has no pending refreshes. It is set to "ready" when there are
pending refreshes and to ”inhibited” when pending refreshes are being
held back because more or more snap applications are running with the
“refresh app awareness” feature enabled.

The "base" and "restart" flags indicate whether the base snap is going to be
updated and/or if a restart will occur, both of which are disruptive. A base
snap update can temporarily disrupt the starting of applications or hooks from
the snap.

To tell snapd to proceed with pending refreshes:
$ snapctl refresh --pending --proceed

Note, a snap using --proceed cannot assume that the updates will occur as they
might be held back by other snaps.

To hold refresh for up to 90 days for the calling snap:
$ snapctl refresh --pending --hold