刚买了一台安装了 20.04 的新戴尔 Vostro。启用非 lts 更新后，更新管理器建议更新到 20.10，我同意了。升级后，更新管理器仍然声称我使用的是 20.04，在“升级到 20.10”后它什么也不做，默默退出。
sudo do-release-upgrade什么也不做。但怀疑“中止”。
Get:1 Upgrade tool signature [819 B]
Get:2 Upgrade tool [1340 kB]
Fetched 1341 kB in 0s (0 B/s)
authenticate 'groovy.tar.gz' against 'groovy.tar.gz.gpg'
extracting 'groovy.tar.gz'
Reading cache
Checking package manager
Reading package lists... Done
Building dependency tree
Reading state information... Done
Hit http://archive.ubuntu.com/ubuntu groovy InRelease
Hit http://archive.canonical.com/ubuntu groovy InRelease
Hit http://archive.ubuntu.com/ubuntu groovy-updates InRelease
Hit http://archive.ubuntu.com/ubuntu groovy-backports InRelease
Hit http://archive.ubuntu.com/ubuntu focal InRelease
Hit http://security.ubuntu.com/ubuntu groovy-security InRelease
Fetched 0 B in 0s (0 B/s)
Reading package lists... Done
Building dependency tree
Reading state information... Done
Checking for installed snaps
Calculating snap size requirements
Updating repository information
Hit http://archive.ubuntu.com/ubuntu groovy InRelease
Hit http://archive.canonical.com/ubuntu groovy InRelease
Hit http://archive.ubuntu.com/ubuntu groovy-updates InRelease
Hit http://archive.ubuntu.com/ubuntu groovy-backports InRelease
Hit http://security.ubuntu.com/ubuntu groovy-security InRelease
Fetched 0 B in 0s (0 B/s)
Checking package manager
Reading package lists... Done
Building dependency tree
Reading state information... Done
Calculating the changes
Calculating the changes
Restoring original system state
Aborting
Reading package lists... Done
Building dependency tree
Reading state information... Done
以下是 main.log 的尾部
2021-05-13 19:43:24,296 DEBUG dir '/var/cache/apt/archives' needs '0' of '<DistUpgrade.DistUpgradeCache.MyCache.checkFreeSpace.<locals>.FreeSpace object at 0x7f2f4eadd2e0>' (136604778496.000000)
2021-05-13 19:43:24,296 DEBUG dir '/usr' needs '0' of '<DistUpgrade.DistUpgradeCache.MyCache.checkFreeSpace.<locals>.FreeSpace object at 0x7f2f4eadd2e0>' (136604778496.000000)
2021-05-13 19:43:24,297 DEBUG dir '/var' needs '0' of '<DistUpgrade.DistUpgradeCache.MyCache.checkFreeSpace.<locals>.FreeSpace object at 0x7f2f4eadd2e0>' (136604778496.000000)
2021-05-13 19:43:24,297 DEBUG dir '/usr' needs '52428800' of '<DistUpgrade.DistUpgradeCache.MyCache.checkFreeSpace.<locals>.FreeSpace object at 0x7f2f4eadd2e0>' (136604778496.000000)
2021-05-13 19:43:24,297 DEBUG dir '/boot' needs '85480317.3' of '<DistUpgrade.DistUpgradeCache.MyCache.checkFreeSpace.<locals>.FreeSpace object at 0x7f2f4eadd2e0>' (136552349696.000000)
2021-05-13 19:43:24,297 DEBUG dir '/tmp' needs '5242880' of '<DistUpgrade.DistUpgradeCache.MyCache.checkFreeSpace.<locals>.FreeSpace object at 0x7f2f4eadd2e0>' (136466869378.699997)
2021-05-13 19:43:24,297 DEBUG dir '/' needs '10485760' of '<DistUpgrade.DistUpgradeCache.MyCache.checkFreeSpace.<locals>.FreeSpace object at 0x7f2f4eadd2e0>' (136461626498.699997)
2021-05-13 19:43:24,297 DEBUG dir '/tmp' needs '0.0' of '<DistUpgrade.DistUpgradeCache.MyCache.checkFreeSpace.<locals>.FreeSpace object at 0x7f2f4eadd2e0>' (136451140738.699997)
2021-05-13 19:43:24,297 DEBUG dir '/usr' needs '0.0' of '<DistUpgrade.DistUpgradeCache.MyCache.checkFreeSpace.<locals>.FreeSpace object at 0x7f2f4eadd2e0>' (136451140738.699997)
2021-05-13 19:43:24,298 DEBUG Found writable ESP /dev/nvme0n1p1 /boot/efi vfat rw,relatime,fmask=0077,dmask=0077,codepage=437,iocharset=iso8859-1,shortname=mixed,errors=remount-ro 0 0
2021-05-13 19:43:24,300 DEBUG demoted: 'libmpdec2 mutter'
2021-05-13 19:43:24,300 DEBUG found components: {'groovy': {'multiverse', 'universe', 'restricted', 'main'}, 'groovy-updates': {'multiverse', 'universe', 'restricted', 'main'}, 'groovy-security': {'multiverse', 'universe', 'restricted', 'main'}}
2021-05-13 19:43:24,300 DEBUG abort called
2021-05-13 19:43:24,303 DEBUG openCache()
2021-05-13 19:43:26,631 DEBUG Comparing 5.8.0-53 with
2021-05-13 19:43:26,702 DEBUG /openCache(), new cache size 70409