I have a 19.04 installation running under Windows Subsystem for Linux. When I try to upgrade to 19.10, the following happens:
$ sudo do-release-upgradeChecking for a new Ubuntu releaseYour Ubuntu release is not supported anymore.For upgrade information, please visit:http://www.ubuntu.com/releaseendoflifeGet:1 Upgrade tool signature [1554 B]Get:2 Upgrade tool [1329 kB]Fetched 1331 kB in 0s (0 B/s)authenticate 'eoan.tar.gz' against 'eoan.tar.gz.gpg'extracting 'eoan.tar.gz'Reading cachepcilib: Cannot open /proc/bus/pcilspci: Cannot find any working access method.Checking package managerReading package lists... DoneBuilding dependency treeReading state information... DoneHit http://archive.ubuntu.com/ubuntu disco InReleaseGet:1 http://archive.ubuntu.com/ubuntu disco-updates InRelease [97.5 kB]Get:2 http://archive.ubuntu.com/ubuntu disco-backports InRelease [88.8 kB]Get:3 http://security.ubuntu.com/ubuntu disco-security InRelease [97.5 kB]Fetched 284 kB in 6s (45.8 kB/s)Reading package lists... DoneBuilding dependency treeReading state information... DoneRestoring original system stateAbortingReading package lists... DoneBuilding dependency treeReading state information... Done=== Command detached from window (Wed Feb 5 12:39:40 2020) ====== Command terminated with exit status 1 (Wed Feb 5 12:39:50 2020) ===
Apparently, the upgrade script wants to probe the PCI bus for some reason, which fails under WSL.