/usr/bin/purge-old-kernels is in byobu 5.125-0ubuntu1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 | #!/bin/sh
#
# purge-old-kernels - remove old kernel packages
# Copyright (C) 2012 Dustin Kirkland <kirkland@ubuntu.com>
#
# Authors: Dustin Kirkland <kirkland@ubuntu.com>
# Kees Cook <kees@ubuntu.com>
#
# This program 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, version 3 of the License.
#
# This program 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.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
# apt autoremove supposedly works correctly now.
#
# Thus, we're deprecating the functionality previously found
# in purge-old-kernels.
#
# If you still have old kernels lying around after this, please
# file a bug against apt: https://bugs.launchpad.net/ubuntu/+source/apt/+filebug
sudo apt-get $@ autoremove
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