I cannot reproduce this. What version of "dpkg" do you have installed?
# apt-get install -y flex
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following extra packages will be installed:
m4
Suggested packages:
bison
The following NEW packages will be installed:
flex m4
0 upgraded, 2 newly installed, 0 to remove and 0 not upgraded.
Need to get 0B/522kB of archives.
After this operation, 1671kB of additional disk space will be used.
Selecting previously deselected package m4.
(Reading database ... 12312 files and directories currently installed.)
Unpacking m4 (from .../m/m4/m4_1.4.11-1_amd64.deb) ...
Selecting previously deselected package flex.
Unpacking flex (from .../flex_2.5.35-2ubuntu1_amd64.deb) ...
Setting up m4 (1.4.11-1) ...
Setting up flex (2.5.35-2ubuntu1) ...
#
** Changed in: flex (Ubuntu)
Status: New => Incomplete
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post-installation script error
https://bugs.launchpad.net/bugs/305505
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