尝试更新系统时出现以下错误：
user# apt-get upgrade
Reading package lists... Done
Building dependency tree
Reading state information... Done
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
2 not fully installed or removed.
After this operation, 0 B of additional disk space will be used.
Do you want to continue [Y/n]? y
Setting up linux-image-3.5.0-25-generic (3.5.0-25.39) ...
Running depmod.
update-initramfs: deferring update (hook will be called later)
Failed to symbolic-link /boot/initrd.img-3.5.0-25-generic to initrd.img:File exists at /var/lib/dpkg/info/linux-image-3.5.0-25-generic.postinst line 614.
dpkg: error …