su -
apt upddate
apt full-upgrade

Reading package lists... Done
Building dependency tree       
Reading state information... Done
Calculating upgrade... Done
The following packages will be upgraded:
  openmediavault-omvextrasorg
1 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
Need to get 65.3 kB of archives.
After this operation, 0 B of additional disk space will be used.
Do you want to continue? [Y/n] n
Abort

apt full-upgrade
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Calculating upgrade... Done
The following packages will be upgraded:
  grub-common grub-pc grub-pc-bin grub2-common
4 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
Need to get 4067 kB of archives.
After this operation, 72.7 kB of additional disk space will be used.
Do you want to continue? [Y/n] 

cat /etc/cron.daily/openmediavault-cron-apt
#!/bin/sh
#
# This file is part of OpenMediaVault.
#
# @license   http://www.gnu.org/licenses/gpl.html GPL Version 3
# @author    Volker Theile <volker.theile@openmediavault.org>
# @copyright Copyright (c) 2009-2021 Volker Theile
#
# OpenMediaVault is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# any later version.
#
# OpenMediaVault is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#cat /var/spool/anacron/cron.daily
# You should have received a copy of the GNU General Public License
# along with OpenMediaVault. If not, see <http://www.gnu.org/licenses/>.

# NOTE:
# If the machine does not run 24/7 it might happen that cron-apt is not
# executed. Because anacron does not execute cron jobs defined in /etc/cron.d
# (where the default cron-apt cron job file is located) this script ensures
# that cron-apt is executed at least once a day.

test -x /usr/sbin/cron-apt && /usr/sbin/cron-apt

cat /etc/anacrontab
# /etc/anacrontab: configuration file for anacron

# See anacron(8) and anacrontab(5) for details.

SHELL=/bin/sh
PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin
HOME=/root
LOGNAME=root

# These replace cron's entries
1       5       cron.daily      run-parts --report /etc/cron.daily
7       10      cron.weekly     run-parts --report /etc/cron.weekly
@monthly        15      cron.monthly    run-parts --report /etc/cron.monthly

cat /etc/cron-apt/config
# This file is auto-generated by openmediavault (https://www.openmediavault.org)
# WARNING: Do not edit this file, your changes will get lost.

# Configuration for cron-apt.
# The cron config is located in /etc/cron.d/cron-apt

# When to send email about the cron-apt results.
# Value: error   (send mail on error runs)
#        upgrade (when packages are upgraded)
#        changes (mail when change in output from an action)
#        output  (send mail when output is generated)
#        always  (always send mail)
#                (else never send mail)
MAILON="upgrade"

# The email address to send mail to.
MAILTO="xxx@gmx.de"

# Value: error   (syslog on error runs)
#        upgrade (when packages is upgraded)
#        changes (syslog when change in output from an action)
#        output  (syslog when output is generated)
#        always  (always syslog)
#                (else never syslog)
SYSLOGON="always"

# Value: verbose (log everything)
#        always  (always log)
#        upgrade (when packages is upgraded)
#        changes (log when change in output from an action)
#        output  (log when output is generated)
#        error   (log error runs only)
#                (else log nothing)
# DEBUG="output"

# General apt options that will be passed to all APTCOMMAND calls.
# Use "-o quiet" instead of "-q" for aptitude compatibility.
#  OPTIONS="-o quiet=1"
# You can for example add an additional sources.list file here.
#  OPTIONS="-o quiet=1 -o Dir::Etc::SourceList=/etc/apt/security.sources.list"
# You can also set an alternative sources.list file here.
#  OPTIONS="-o quiet=1 -o Dir::Etc::SourceList=/etc/apt/security.sources.list -o Dir::Etc::SourceParts=\"/dev/null\""
# If you want to allow unauthenticated and untrusted packages add the
# following to your options directive.
#  OPTIONS="-o quiet=1 -o APT::Get::AllowUnauthenticated=true -o aptitude::Cmdline::ignore-trust-violations=yes"
# To limit the bandwidth used use the following line. This example limit the
# bandwidth usage to 25 kB/s.
#  OPTIONS="-o Acquire::http::Dl-Limit=25"
OPTIONS=""