[Bug 1895546] [NEW] upgrade to 20.04 LTS crashes

Public bug reported: Multiple upgrade tests fail, without explanation. I've found into the log files without research path. ProblemType: Bug DistroRelease: Ubuntu 18.04 Package: ubuntu-release-upgrader-core 1:18.04.38 ProcVersionSignature: Ubuntu 4.15.0-115.116-generic 4.15.18 Uname: Linux 4.15.0

[Bug 1892028] [NEW] Impossible to upgrade to 20.04 lts from 18.04

Public bug reported: Probably error in cache: 2020-08-18 13:59:05,049 DEBUG running doUpdate() (showErrors=False) 2020-08-18 13:59:15,107 ERROR IOError/SystemError in cache.update(): ''. Retrying (currentRetry: 0) 2020-08-18 13:59:15,108 ERROR doUpdate() failed completely 2020-08-18 13:59:15,108