Ubuntu 18.04.6 LTSです
$ sudo apt update && apt list --upgradable
:
libasn1-8-heimdal/bionic-updates,bionic-security 7.5.0+dfsg-1ubuntu0.1 amd64 [upgradable from: 7.5.0+dfsg-1]
libgssapi3-heimdal/bionic-updates,bionic-security
libhcrypto4-heimdal/bionic-updates,bionic-security
libheimbase1-heimdal/bionic-updates,bionic-security
libheimntlm0-heimdal/bionic-updates,bionic-security
libhx509-5-heimdal/bionic-updates,bionic-security
libkrb5-26-heimdal/bionic-updates,bionic-security
libroken18-heimdal/bionic-updates,bionic-security
libwind0-heimdal/bionic-updates,bionic-security
$ sudo apt dist-upgrade -y
$ cat /var/run/reboot-required*
cat: '/var/run/reboot-required*': No such file or directory
ヨシ