我有一个要求libgtkmm-2.4-1c2a依赖的安装程序，尽管apt-get没有。apt-get建议libgtkmm-2.4-1v5改为，但这不起作用。
我正在运行Ubuntu 16.如何降级？
编辑：
Ubuntu 16.04 LTS
输出apt-cache policy libgtkmm-2.4-1v5：
libgtkmm-2.4-1v5:
Installed: 1:2.24.4-2
Candidate: 1:2.24.4-2
Version table:
*** 1:2.24.4-2 500
500 http://us.archive.ubuntu.com/ubuntu xenial/main amd64 Packages
100 /var/lib/dpkg/status
输出sudo apt-get check：
Reading package lists... Done
Building dependency tree
Reading state information... Done
You might want to run 'apt-get -f install' to correct these.
The following packages have unmet dependencies:
libflycapturegui2 : Depends: libgtkmm-2.4-1c2a but it is not installable
Depends: libglademm-2.4-1c2a but it is not installable
libflycapturegui2-dev : Depends: libgtkmm-2.4-1c2a but it is not installable
Depends: libglademm-2.4-1c2a but it is not installable
运行apt-get -f install这样做：
Reading package lists... Done
Building dependency tree
Reading state information... Done
Correcting dependencies... Done
The following packages will be REMOVED:
libflycapturegui2 libflycapturegui2-dev
0 upgraded, 0 newly installed, 2 to remove and 146 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
(Reading database ... 217420 files and directories currently installed.)
Removing libflycapturegui2-dev (2.9.3.43) ...
Removing libflycapturegui2 (2.9.3.43) ...
Processing triggers for libc-bin (2.23-0ubuntu9) ...
之后sudo apt-get check给出：
Reading package lists... Done
Building dependency tree
Reading state information... Done
libgtkmm-2.4-1c2a如您所见，该功能在16.04中不可用。它在14.04中可用，因此您可以安装14.04或询问您要安装的软件包的维护者，以提供与16.04兼容的软件包。
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