我努力了：
sudo apt-get 更新
Get:1 http://security.ubuntu.com/ubuntu xenial-security InRelease [107 kB]
Hit:2 http://us.archive.ubuntu.com/ubuntu xenial InRelease
Hit:3 http://software.virtualmin.com/vm/6/gpl/apt virtualmin-xenial InRelease
Get:4 http://us.archive.ubuntu.com/ubuntu xenial-updates InRelease [109 kB]
Hit:5 http://software.virtualmin.com/vm/6/gpl/apt virtualmin-universal InRelease
Get:6 http://us.archive.ubuntu.com/ubuntu xenial-backports InRelease [107 kB]
Fetched 323 kB in 1s (283 kB/s)
Reading package lists...
sudo apt-get 升级
Reading package lists...
Building dependency tree...
Reading state information...
Calculating upgrade...
The following packages will be REMOVED:
linux-image-4.4.0-116-generic linux-image-4.4.0-96-generic
linux-image-extra-4.4.0-116-generic linux-image-extra-4.4.0-122-generic
linux-image-extra-4.4.0-96-generic
The following packages have been kept back:
linux-headers-generic
The following packages will be upgraded:
distro-info-data grub-legacy-ec2 linux-libc-dev wget
4 upgraded, 0 newly installed, 5 to remove and 1 not upgraded.
7 not fully installed or removed.
Need to get 877 kB/1,177 kB of archives.
After this operation, 598 MB disk space will be freed.
Do you want to continue? [Y/n] Abort.
sudo apt-get -f 安装
Reading package lists...
Building dependency tree...
Reading state information...
The following packages will be REMOVED:
linux-image-4.4.0-116-generic linux-image-4.4.0-96-generic
linux-image-extra-4.4.0-116-generic linux-image-extra-4.4.0-122-generic
linux-image-extra-4.4.0-96-generic
0 upgraded, 0 newly installed, 5 to remove and 5 not upgraded.
7 not fully installed or removed.
After this operation, 598 MB disk space will be freed.
Do you want to continue? [Y/n] Abort.
sudo apt-get dist-upgrade
Reading package lists...
Building dependency tree...
Reading state information...
Calculating upgrade...
The following NEW packages will be installed:
linux-headers-4.4.0-124 linux-headers-4.4.0-124-generic
linux-image-4.4.0-122-generic
The following packages will be upgraded:
distro-info-data grub-legacy-ec2 linux-headers-generic linux-libc-dev wget
5 upgraded, 3 newly installed, 0 to remove and 0 not upgraded.
7 not fully installed or removed.
Need to get 187 MB/187 MB of archives.
After this operation, 146 MB of additional disk space will be used.
Do you want to continue? [Y/n] Abort.
它不让我选择 Y/n，它自行中止......
我对 Ubuntu 没什么经验。请帮帮我。
先感谢您。