Seeing the same behaviour on this 16.04 system:
$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 16.04.5 LTS
Release: 16.04
Codename: xenial
$ apt-cache policy update-manager
update-manager:
Installed: 1:16.04.13
Candidate: 1:16.04.13
Version table:
*** 1:16.04.13 500
500 http://dk.archive.ubuntu.com/ubuntu xenial-updates/main amd64
Packages
500 http://dk.archive.ubuntu.com/ubuntu xenial-updates/main i386
Packages
100 /var/lib/dpkg/status
1:16.04.12 500
500 http://security.ubuntu.com/ubuntu xenial-security/main amd64
Packages
500 http://security.ubuntu.com/ubuntu xenial-security/main i386 Packages
1:16.04.3 500
500 http://dk.archive.ubuntu.com/ubuntu xenial/main amd64 Packages
500 http://dk.archive.ubuntu.com/ubuntu xenial/main i386 Packages
$ apt list --upgradeable
Listing... Done
chromium-browser/xenial-updates,xenial-security 68.0.3440.106-0ubuntu0.16.04.1
amd64 [upgradable from: 68.0.3440.75-0ubuntu0.16.04.1]
chromium-browser-l10n/xenial-updates,xenial-updates,xenial-security,xenial-security
68.0.3440.106-0ubuntu0.16.04.1 all [upgradable from:
68.0.3440.75-0ubuntu0.16.04.1]
chromium-codecs-ffmpeg-extra/xenial-updates,xenial-security
68.0.3440.106-0ubuntu0.16.04.1 amd64 [upgradable from:
68.0.3440.75-0ubuntu0.16.04.1]
flashplugin-installer/xenial-updates,xenial-security 30.0.0.154ubuntu0.16.04.1
amd64 [upgradable from: 30.0.0.134ubuntu0.16.04.1]
gir1.2-javascriptcoregtk-4.0/xenial-updates,xenial-security
2.20.5-0ubuntu0.16.04.1 amd64 [upgradable from: 2.20.3-0ubuntu0.16.04.1]
gir1.2-webkit2-4.0/xenial-updates,xenial-security 2.20.5-0ubuntu0.16.04.1 amd64
[upgradable from: 2.20.3-0ubuntu0.16.04.1]
josm/unknown,unknown 1.5.svn14163 all [upgradable from: 1.5.svn14066]
libapache2-mod-php/xenial,xenial 1:7.2+62+ubuntu16.04.1+deb.sury.org+3 all
[upgradable from: 1:7.2+62+ubuntu16.04.1+deb.sury.org+1]
libapache2-mod-php7.2/xenial 7.2.9-1+ubuntu16.04.1+deb.sury.org+1 amd64
[upgradable from: 7.2.8-1+ubuntu16.04.1+deb.sury.org+1]
libjavascriptcoregtk-4.0-18/xenial-updates,xenial-security
2.20.5-0ubuntu0.16.04.1 amd64 [upgradable from: 2.20.3-0ubuntu0.16.04.1]
libjavascriptcoregtk-4.0-dev/xenial-updates,xenial-security
2.20.5-0ubuntu0.16.04.1 amd64 [upgradable from: 2.20.3-0ubuntu0.16.04.1]
libnss-myhostname/xenial-updates 229-4ubuntu21.4 amd64 [upgradable from:
229-4ubuntu21.2]
libpam-systemd/xenial-updates 229-4ubuntu21.4 amd64 [upgradable from:
229-4ubuntu21.2]
libpq5/xenial-updates,xenial-security 9.5.14-0ubuntu0.16.04 amd64 [upgradable
from: 9.5.13-0ubuntu0.16.04]
libsystemd-dev/xenial-updates 229-4ubuntu21.4 amd64 [upgradable from:
229-4ubuntu21.2]
libsystemd0/xenial-updates 229-4ubuntu21.4 amd64 [upgradable from:
229-4ubuntu21.2]
libudev-dev/xenial-updates 229-4ubuntu21.4 amd64 [upgradable from:
229-4ubuntu21.2]
libudev1/xenial-updates 229-4ubuntu21.4 amd64 [upgradable from: 229-4ubuntu21.2]
libwebkit2gtk-4.0-37/xenial-updates,xenial-security 2.20.5-0ubuntu0.16.04.1
amd64 [upgradable from: 2.20.3-0ubuntu0.16.04.1]
libwebkit2gtk-4.0-37-gtk2/xenial-updates,xenial-security
2.20.5-0ubuntu0.16.04.1 amd64 [upgradable from: 2.20.3-0ubuntu0.16.04.1]
libwebkit2gtk-4.0-dev/xenial-updates,xenial-security 2.20.5-0ubuntu0.16.04.1
amd64 [upgradable from: 2.20.3-0ubuntu0.16.04.1]
php-cli/xenial,xenial 1:7.2+62+ubuntu16.04.1+deb.sury.org+3 all [upgradable
from: 1:7.2+62+ubuntu16.04.1+deb.sury.org+1]
php-common/xenial,xenial 1:62+ubuntu16.04.1+deb.sury.org+3 all [upgradable
from: 1:62+ubuntu16.04.1+deb.sury.org+1]
php-curl/xenial,xenial 1:7.2+62+ubuntu16.04.1+deb.sury.org+3 all [upgradable
from: 1:7.2+62+ubuntu16.04.1+deb.sury.org+1]
php-igbinary/xenial 2.0.7-1+ubuntu16.04.1+deb.sury.org+1 amd64 [upgradable
from: 2.0.6~rc1-1+ubuntu16.04.1+deb.sury.org+1]
php-interbase/xenial,xenial 1:7.2+62+ubuntu16.04.1+deb.sury.org+3 all
[upgradable from: 1:7.2+62+ubuntu16.04.1+deb.sury.org+1]
php-mbstring/xenial,xenial 1:7.2+62+ubuntu16.04.1+deb.sury.org+3 all
[upgradable from: 1:7.2+62+ubuntu16.04.1+deb.sury.org+1]
php-mysql/xenial,xenial 1:7.2+62+ubuntu16.04.1+deb.sury.org+3 all [upgradable
from: 1:7.2+62+ubuntu16.04.1+deb.sury.org+1]
php-sqlite3/xenial,xenial 1:7.2+62+ubuntu16.04.1+deb.sury.org+3 all [upgradable
from: 1:7.2+62+ubuntu16.04.1+deb.sury.org+1]
php-xml/xenial,xenial 1:7.2+62+ubuntu16.04.1+deb.sury.org+3 all [upgradable
from: 1:7.2+62+ubuntu16.04.1+deb.sury.org+1]
php7.2-cli/xenial 7.2.9-1+ubuntu16.04.1+deb.sury.org+1 amd64 [upgradable from:
7.2.8-1+ubuntu16.04.1+deb.sury.org+1]
php7.2-common/xenial 7.2.9-1+ubuntu16.04.1+deb.sury.org+1 amd64 [upgradable
from: 7.2.8-1+ubuntu16.04.1+deb.sury.org+1]
php7.2-curl/xenial 7.2.9-1+ubuntu16.04.1+deb.sury.org+1 amd64 [upgradable from:
7.2.8-1+ubuntu16.04.1+deb.sury.org+1]
php7.2-dev/xenial 7.2.9-1+ubuntu16.04.1+deb.sury.org+1 amd64 [upgradable from:
7.2.8-1+ubuntu16.04.1+deb.sury.org+1]
php7.2-interbase/xenial 7.2.9-1+ubuntu16.04.1+deb.sury.org+1 amd64 [upgradable
from: 7.2.8-1+ubuntu16.04.1+deb.sury.org+1]
php7.2-json/xenial 7.2.9-1+ubuntu16.04.1+deb.sury.org+1 amd64 [upgradable from:
7.2.8-1+ubuntu16.04.1+deb.sury.org+1]
php7.2-mbstring/xenial 7.2.9-1+ubuntu16.04.1+deb.sury.org+1 amd64 [upgradable
from: 7.2.8-1+ubuntu16.04.1+deb.sury.org+1]
php7.2-mysql/xenial 7.2.9-1+ubuntu16.04.1+deb.sury.org+1 amd64 [upgradable
from: 7.2.8-1+ubuntu16.04.1+deb.sury.org+1]
php7.2-opcache/xenial 7.2.9-1+ubuntu16.04.1+deb.sury.org+1 amd64 [upgradable
from: 7.2.8-1+ubuntu16.04.1+deb.sury.org+1]
php7.2-readline/xenial 7.2.9-1+ubuntu16.04.1+deb.sury.org+1 amd64 [upgradable
from: 7.2.8-1+ubuntu16.04.1+deb.sury.org+1]
php7.2-sqlite3/xenial 7.2.9-1+ubuntu16.04.1+deb.sury.org+1 amd64 [upgradable
from: 7.2.8-1+ubuntu16.04.1+deb.sury.org+1]
php7.2-xml/xenial 7.2.9-1+ubuntu16.04.1+deb.sury.org+1 amd64 [upgradable from:
7.2.8-1+ubuntu16.04.1+deb.sury.org+1]
postgresql-9.5/xenial-updates,xenial-security 9.5.14-0ubuntu0.16.04 amd64
[upgradable from: 9.5.13-0ubuntu0.16.04]
postgresql-client-9.5/xenial-updates,xenial-security 9.5.14-0ubuntu0.16.04
amd64 [upgradable from: 9.5.13-0ubuntu0.16.04]
postgresql-contrib-9.5/xenial-updates,xenial-security 9.5.14-0ubuntu0.16.04
amd64 [upgradable from: 9.5.13-0ubuntu0.16.04]
squashfs-tools/xenial-updates 1:4.3-3ubuntu2.16.04.3 amd64 [upgradable from:
1:4.3-3ubuntu2.16.04.2]
systemd/xenial-updates 229-4ubuntu21.4 amd64 [upgradable from: 229-4ubuntu21.2]
systemd-sysv/xenial-updates 229-4ubuntu21.4 amd64 [upgradable from:
229-4ubuntu21.2]
udev/xenial-updates 229-4ubuntu21.4 amd64 [upgradable from: 229-4ubuntu21.2]
wpasupplicant/xenial-updates,xenial-security 2.4-0ubuntu6.3 amd64 [upgradable
from: 2.4-0ubuntu6.2]
** Attachment added: "Blank list of updates"
https://bugs.launchpad.net/ubuntu/+source/update-manager/+bug/1783023/+attachment/5178149/+files/Screenshot%20from%202018-08-20%2019-12-37.png
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https://bugs.launchpad.net/bugs/1783023
Title:
Software Updater is sometimes blank when there are ONLY phased updates
and auto-removable kernels
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