无法执行发布升级

无法执行发布升级

我确实可以正常访问互联网,并且我当前的 IP(在英国),82.47.29.14但我的笔记本电脑仍然连接到德国服务器91.189.91.24 80

但现在我无法做到do-release-upgrade

alvas@ubi:~$ sudo do-release-upgrade -d
Checking for a new Ubuntu release
Err Upgrade tool signature                                                                                                                                              
  404  Not Found [IP: 91.189.91.24 80]                                                                                                                                  
Err Upgrade tool                                                                                                                                                        
  404  Not Found [IP: 91.189.91.24 80]                                                                                                                                  
Fetched 0 B in 0s (0 B/s)                                                                                                                                               
WARNING:root:file 'utopic.tar.gz.gpg' missing
Failed to fetch
Fetching the upgrade failed. There may be a network problem. 
alvas@ubi:~$ sudo do-release-upgrade -d
Checking for a new Ubuntu release
Err Upgrade tool signature                                                                                                                                              
  404  Not Found [IP: 91.189.91.23 80]                                                                                                                                  
Err Upgrade tool                                                                                                                                                        
  404  Not Found [IP: 91.189.91.23 80]                                                                                                                                  
Fetched 0 B in 0s (0 B/s)                                                                                                                                               
WARNING:root:file 'utopic.tar.gz.gpg' missing
Failed to fetch
Fetching the upgrade failed. There may be a network problem. 

我该如何解决这个问题才能do-release-upgrade

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