In my case, this bug happen while upgrading from 14.04 to 16.04.
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https://bugs.launchpad.net/bugs/1509816
Title:
Upgrade from 14.04 to 15.04 missed systemd
To recover a machine affected by this issue:
* I followed the instructions in
https://help.ubuntu.com/community/LiveCdRecovery#Update_Failure
* sudo dpkg --configure -a
* sudo apt-get install systemd-sysv init
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** This bug is no longer a duplicate of bug 1032823
package libdevmapper-event1.02.1 2:1.02.48-4ubuntu7.1 failed to
install/upgrade: ErrorMessage: dependency problems - leaving unconfigured
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I've checked Apttermlog.txt more carefully, and it seems to be caused by
a circular dependency:
systemd-sysv < systemd < libcryptsetup4 < libdevmapper1.02.1:amd64 <
dmsetup < libdevmapper1.02.1
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