Also Ubuntu 18.04.1 LTS here.
I tracked down the issue to the plymouth-theme-kubuntu-text.postinst
script:
Comparing /var/lib/dpkg/info/plymouth-theme-ubuntu-text.postinst and
/var/lib/dpkg/info/plymouth-theme-kubuntu-text.postinst we see that the
first has:
----------------------------------------
case "$1" in
configure|triggered)
if [ "$1" = "configure" ]; then
# We remove leftover generated file from previous plymouth
version. Can be removed on xenial+1
if dpkg --compare-versions "$2" le-nl "0.9.2-3ubuntu1~"; then
rm -f
/lib/plymouth/themes/ubuntu-text/ubuntu-text.plymouth
fi
fi
----------------------------------------
while the second has:
----------------------------------------
case "$1" in
configure|triggered)
# We remove leftover generated file from previous plymouth version. Can
be removed on xenial+1
if dpkg --compare-versions "$2" le-nl "1:16.04ubuntu1~"; then
rm -f /lib/plymouth/themes/kubuntu-text/kubuntu-text.plymouth
fi
----------------------------------------
Notice the missing check for the "configure" argument. Also see
http://man7.org/linux/man-pages/man5/deb-postinst.5.html:
postinst configure old-version
After the package was installed.
postinst triggered trigger-name...
After the package was triggered.
The actual "bad syntax" message is then generated because
dpkg --compare-versions "$2" le-nl "1:16.04ubuntu1~"
resolves to
dpkg --compare-versions "/etc/lsb-release" le-nl "1:16.04ubuntu1~"
which is of course not what dpkg expects ("/etc/lsb-release" being the
trigger-name)
So the bug seems to be a missing check for "configure" in the kubuntu
version of the plymouth-theme postinst script.
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https://bugs.launchpad.net/bugs/1597466
Title:
dpkg giving warning about '/etc/lsb-release' version number not
starting with a digit when there is no apparent problem in the file
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