jeromexiong@ubuntu:~$ sudo apt-get install libssl-dev Reading package lists... Done Building dependency tree Reading state information... Done Some packages could not be installed. This may mean that you have requested an impossible situation or if you are using the unstable distribution that some required packages have not yet been created or been moved out of Incoming. The following information may help to resolve the situation:
The following packages have unmet dependencies: libssl-dev : Depends: libssl1.0.0 (= 1.0.1f-1ubuntu2) but 1.0.1f-1ubuntu2.19 is to be installed Recommends: libssl-doc but it is not going to be installed E: Unable to correct problems, you have held broken packages.
jeromexiong@ubuntu:~$ sudo aptitude install libssl-dev The following NEW packages will be installed: libssl-dev{b} libssl-doc{a} 0 packages upgraded, 2 newly installed, 0 to remove and 0 not upgraded. Need to get 2,031 kB of archives. After unpacking 7,801 kB will be used. The following packages have unmet dependencies: libssl-dev : Depends: libssl1.0.0 (= 1.0.1f-1ubuntu2) but 1.0.1f-1ubuntu2.19 is installed. The following actions will resolve these dependencies:
Keep the following packages at their current version: 1) libssl-dev [Not Installed]
# 这里提示时，一定要选n，选Y跟apt-get install操作一样 Accept this solution? [Y/n/q/?] n The following actions will resolve these dependencies:
Downgrade the following packages: 1) libssl1.0.0 [1.0.1f-1ubuntu2.19 (now) -> 1.0.1f-1ubuntu2 (trusty)]
# 接受这里的降级处理，成功安装 Accept this solution? [Y/n/q/?] y The following packages will be DOWNGRADED: libssl1.0.0 The following NEW packages will be installed: libssl-dev libssl-doc{a} 0 packages upgraded, 2 newly installed, 1 downgraded, 0 to remove and 0 not upgraded. Need to get 2,857 kB of archives. After unpacking 7,784 kB will be used. Do you want to continue? [Y/n/?] y Get: 1 http://mirrors.aliyun.com/ubuntu/ trusty/main libssl1.0.0 amd64 1.0.1f-1ubuntu2 [825 kB] Get: 2 http://mirrors.aliyun.com/ubuntu/ trusty/main libssl-doc all 1.0.1f-1ubuntu2 [965 kB] Get: 3 http://mirrors.aliyun.com/ubuntu/ trusty/main libssl-dev amd64 1.0.1f-1ubuntu2 [1,066 kB] Fetched 2,857 kB in 50s (57.1 kB/s) Preconfiguring packages ... dpkg: warning: downgrading libssl1.0.0:amd64 from 1.0.1f-1ubuntu2.19 to 1.0.1f-1ubuntu2 (Reading database ... 234481 files and directories currently installed.) Preparing to unpack .../libssl1.0.0_1.0.1f-1ubuntu2_amd64.deb ... Unpacking libssl1.0.0:amd64 (1.0.1f-1ubuntu2) over (1.0.1f-1ubuntu2.19) ... Selecting previously unselected package libssl-dev:amd64. Preparing to unpack .../libssl-dev_1.0.1f-1ubuntu2_amd64.deb ... Unpacking libssl-dev:amd64 (1.0.1f-1ubuntu2) ... Selecting previously unselected package libssl-doc. Preparing to unpack .../libssl-doc_1.0.1f-1ubuntu2_all.deb ... Unpacking libssl-doc (1.0.1f-1ubuntu2) ... Processing triggers for man-db (2.6.7.1-1ubuntu1) ... Setting up libssl1.0.0:amd64 (1.0.1f-1ubuntu2) ... Setting up libssl-dev:amd64 (1.0.1f-1ubuntu2) ... Setting up libssl-doc (1.0.1f-1ubuntu2) ... Processing triggers for libc-bin (2.19-0ubuntu6.9) ...
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