pi@ydl_pi:~ $ sudo aptitude install mysql-server-5.5 The following NEW packages will be installed:
libaio1{a} libdbd-mysql-perl{ab} libdbi-perl{ab}
libhtml-template-perl{a} libmysqlclient16{a} mysql-client-5.5{a}
mysql-common{a} mysql-server-5.5 mysql-server-core-5.5{a}
0 packages upgraded, 9 newly installed, 0 to remove and 48 not upgraded.
Need to get 8,598 kB/9,489 kB of archives. After unpacking 90.2 MB will be used.
The following packages have unmet dependencies:
libdbi-perl : Depends: perlapi-5.14.2 which is a virtual package.
libdbd-mysql-perl : Depends: perlapi-5.14.2 which is a virtual package.
The following actions will resolve these dependencies:
Keep the following packages at their current version:
1) libdbd-mysql-perl [Not Installed]
2) libdbi-perl [Not Installed]
3) mysql-client-5.5 [Not Installed]
4) mysql-server-5.5 [Not Installed]
Accept this solution? [Y/n/q/?] y
No packages will be installed, upgraded, or removed.
0 packages upgraded, 0 newly installed, 0 to remove and 48 not upgraded.
Need to get 0 B of archives. After unpacking 0 B will be used.
debconf: Perl may be unconfigured (Can't locate Debconf/Log.pm in @INC (@INC contains: /usr/lib/perl5/site_perl/5.14.2/armv7l-linux /usr/lib/perl5/site_perl/5.14.2 /usr/lib/perl5/5.14.2/armv7l-linux /usr/lib/perl5/5.14.2 .) at (eval 1) line 4.
BEGIN failed--compilation aborted at (eval 1) line 4.
) -- aborting
pi@ydl_pi:~ $

为什么我安装mysql是用的sudo apt-get install mysql-server....?

同楼主，不知楼主解决了没有？

apt源的问题，改一下源