我有一台在 ubuntu 8.04 (Hardy) 上运行的旧服务器。我需要将其升级到最新版本。当我发出 do-release-upgrade 命令时，出现以下错误。我不知道该怎么办！对此的任何帮助表示赞赏。
root@server:~# do-release-upgrade
Checking for a new ubuntu release
Failed Upgrade tool signature
Failed Upgrade tool
Done downloading
extracting '/tmp/tmp2qqi4S/intrepid.tar.gz'
Traceback (most recent call last):
File "/usr/bin/do-release-upgrade", line 45, in <module>
fetcher.run()
File "/usr/lib/python2.5/site-packages/UpdateManager/Core/DistUpgradeFetcherCo
re.py", line 160, in run
if not self.extractDistUpgrader():
File "/usr/lib/python2.5/site-packages/UpdateManager/Core/DistUpgradeFetcherCo
re.py", line 98, in extractDistUpgrader
tar = tarfile.open(self.tmpdir+"/"+os.path.basename(self.uri),"r")
File "/usr/lib/python2.5/tarfile.py", line 1148, in open
return func(name, "r", fileobj)
File "/usr/lib/python2.5/tarfile.py", line 1209, in gzopen
fileobj = file(name, mode + "b") …