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It also makes no difference if I append 0x in front of the address.
$ geth --unlock b028139195ff5951ea3e8cd67b0242af024df884 console
.
.
...
Passphrase: *************
Fatal: Unlock account failed 'open /home/user/.ethereum/keystore/3863643637623032343261663032346466383834/3863643637623032343261663032346466383834: no such file or directory'
$ geth version
Geth
Version: 0.9.20
Protocol Version: 60
Network Id: 0
Go Version: go1.4.2
OS: linux
GOPATH=/home/user/go
GOROOT=/usr/lib/go
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Btw I followed the Installation instructions there.