I've had this same problem. Saving through the menu and restarting fixes
it for me, but when it happens every few minutes, even that becomes
annoying.
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https://bugs.launchpad.net/bugs/1336
Public bug reported:
.
ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubiquity 18.04.14
ProcVersionSignature: Ubuntu 4.15.0-20.21-lowlatency 4.15.17
Uname: Linux 4.15.0-20-lowlatency x86_64
ApportVersion: 2.20.9-0ubuntu7
Architecture: amd64
CasperVersion: 1.394
Date: Wed Aug 1 22:17:07 20