In Message <cadcyzv5pe4djovbjtxn8pbpqjdkpjcm6ofyqp2qmegqxssc...@mail.gmail.com>,
        Takatsugu Nokubi <nok...@gmail.com> writes:
> What Japanese engines do you use? I had uim-anthy and uim-mozc, and it works.

I use uim-anthy. If /var/lib/uim/{installed-modules,loader}.scm are
disappeared, uim-toolbar does not work properly, and I cannot switch
input system to anthy.

> I tried to upgrade a stretch machine to buster, but the problem is not
> reploduced.
> Those files are generated by uim-module-manager, and the command is
> invoked by maintainer scripts.

For test, I installed stretch, and upgraded it to buster. After that,
some stretch packages which have been removed during upgrading to buster
leaved conf files.

buster$ dpkg -l | egrep -v ^ii
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name                                  Version                         
Architecture Description
+++-=====================================-===============================-============-===============================================================================
rc  libreoffice-style-galaxy              1:5.2.7-1+deb9u11               all   
       office productivity suite -- Galaxy (Default) symbol style
rc  libsensors4:amd64                     1:3.4.0-4                       amd64 
       library to read temperature/voltage/fan sensors
rc  libuim-data                           1:1.8.6+gh20161003.0.d63dadd-2  all   
       Universal Input Method - data files

Then I purged these packages.

buster# apt-get purge $(dpkg -l | awk '$1=="rc"{print $2}')

Then, when libuim-data is purged, /var/lib/uim/installed-modules.scm
and /var/lib/uim/loader.scm are disappeared, since the postrm script of
libuim-data deletes them.
This was the cause why these files disappeared in my environment.

Since /var/lib/uim/{installed-modules,loader}.scm are still used by uim,
I think that the postrm script of libuim-data should not delete these files
after upgrading to buster.

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