我要升级套餐基本文件而不覆盖/etc/issue。因此，我使用 --assume-no 来禁用配置文件的修改，但这会被忽略，并且 apt-get 在安装时会要求输入。
我尝试了 -y 得到了相同的结果。以前搞过很多次了，没搞明白到底是哪里出了问题……
root@tbox4712:/# apt-get --assume-no install base-files
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages will be upgraded:
base-files
1 to upgrade, 0 to newly install, 0 to remove and 199 not to upgrade.
Need to get 67.5 kB of archives.
After this operation, 0 B of additional disk space will be used.
Get:1 ssh://213.216.5.248/opt/tiqcon/repos/ tiqcon/main base-files amd64 7.2ubuntu5.5 [67.5 kB]
Fetched 67.5 kB in 3s (18.7 kB/s)
(Reading database ... 64889 files and directories currently installed.)
Preparing to unpack .../base-files_7.2ubuntu5.5_amd64.deb ...
Unpacking base-files (7.2ubuntu5.5) over (7.2ubuntu5.1) ...
Processing triggers for plymouth-theme-ubuntu-text (0.8.8-0ubuntu17) ...
update-initramfs: deferring update (trigger activated)
Processing triggers for install-info (5.2.0.dfsg.1-2) ...
Processing triggers for man-db (2.6.7.1-1) ...
Processing triggers for initramfs-tools (0.103ubuntu4.2) ...
update-initramfs: Generating /boot/initrd.img-3.13.0-32-generic
Setting up base-files (7.2ubuntu5.5) ...
Configuration file '/etc/issue'
==> Modified (by you or by a script) since installation.
==> Package distributor has shipped an updated version.
What would you like to do about it ? Your options are:
Y or I : install the package maintainer's version
N or O : keep your currently-installed version
D : show the differences between the versions
Z : start a shell to examine the situation
The default action is to keep your current version.
*** issue (Y/I/N/O/D/Z) [default=N] ?