Comment 53 for bug 927636

I can confirm that after doing dpkg-reconfigure plymouth the issue is not appearing (no errors showing)

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$ apt-cache policy plymouth
plymouth:
  Installed: 0.9.3-1ubuntu2
  Candidate: 0.9.3-1ubuntu2
  Version table:
 *** 0.9.3-1ubuntu2 500
        500 http://rs.archive.ubuntu.com/ubuntu bionic/main amd64 Packages
        100 /var/lib/dpkg/status

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$ lsb_release -rd
Description: Ubuntu Bionic Beaver (development branch)
Release: 18.04

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4.15.0-12-generic #13-Ubuntu SMP Thu Mar 8 06:24:47 UTC 2018

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Still, not sure if related to this, the cursor still dissapearing on the login screen.