Comment 10 for bug 1746582

I just encounter the same issue, in my case, i run the following commands to solve it temporarily:

$ uname -a
Linux ckh-desktop 4.15.0-29-generic #31-Ubuntu SMP Tue Jul 17 15:39:52 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux

$ sudo /bin/rm -rf /etc/lvm/
$ sudo rm -rf /etc/lvm/backup/
$ sudo apt purge lvm2
$ sudo updatdb
$ sudo locate lvm2
$ sudo rm /var/crash/lvm2.0.crash
$ sudo rm /etc/systemd/system/lvm2-*
$ sudo rm /etc/systemd/system/sysinit.target.wants/lvm2-*
$ sudo apt install lvm2
$ sudo apt update
$ sudo apt upgrade