I my case same problem when upgrading from 19.04 to 19.10 on VirtualBox
VM.
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https://bugs.launchpad.net/bugs/1848797
Title:
After upgrading to 19.10, boot screen shows: "Error: symbol
In build 20181015 problem disappeared.
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https://bugs.launchpad.net/bugs/1797725
Title:
installation ubuntu 18.10 beta crashes after commit partitionning.
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Public bug reported:
Install ubuntu 18.10 on uefi system side by side with windows 10 in
place where ubuntu 18.04 resides before crashed after changes in
partitions was accepted. At this moment I don't know if some changes in
system was made already.
ProblemType: Bug
DistroRelease: Ubuntu 18.10
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