在我的服务器上，我遇到了以下问题。 sudo apt-get update工作成功，但sudo apt-get upgrade失败并出现以下错误。请帮我解决这个问题。
administrator@myserver:~$ sudo apt-get upgrade
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages have been kept back:
firefox linux-headers-server linux-image-server linux-server
0 upgraded, 0 newly installed, 0 to remove and 4 not upgraded.
21 not fully installed or removed.
After this operation, 0B of additional disk space will be used.
Do you want to continue [Y/n]? y
Setting up shared-mime-info (0.71-1ubuntu2) ...
/var/lib/dpkg/info/shared-mime-info.postinst: line 13: 17650 …