root@P200:/home/simon# apt-get -f install
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
Correcting dependencies... Done
The following additional packages will be installed:
  libc-bin libc6
Suggested packages:
  glibc-doc libnss-nis libnss-nisplus
Recommended packages:
  manpages
The following packages will be upgraded:
  libc-bin libc6
2 upgraded, 0 newly installed, 0 to remove and 1009 not upgraded.
2 not fully installed or removed.
Need to get 0 B/3,388 kB of archives.
After this operation, 289 kB disk space will be freed.
Do you want to continue? [Y/n] y
Preconfiguring packages ...
(Reading database ... 95951 files and directories currently installed.)
Preparing to unpack .../libc6_2.38-13_amd64.deb ...
Checking for services that may need to be restarted...
Checking init scripts...

The current installation does not have a merged-/usr layout.
This is unsupported and unpacking libc6 would break the system.
Refusing to unpack. Please install the usrmerge package and try again.

dpkg: error processing archive /var/cache/apt/archives/libc6_2.38-13_amd64.deb (--unpack):
 new libc6:amd64 package pre-installation script subprocess returned error exit status 1
Errors were encountered while processing:
 /var/cache/apt/archives/libc6_2.38-13_amd64.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)