I found the problem.
It was on /etc/apparmor.d/usr.sbin.mysqld , which clever unbuntu-bug
found it was modified.
During upgrade, I was asked whether to substitute this file with a new
version, but since I needed some of the current configuration and since
I thought the changes where cosmetic (but they were not!), I choosed to
keep my file.
I compared my file with the base version and applied the changes myself,
and it worked. The changes were:
===
diff -u /etc/apparmor.d/usr.sbin.mysqld.bak /etc/apparmor.d/usr.sbin.mysqld
--- /etc/apparmor.d/usr.sbin.mysqld.bak 2011-10-17 10:02:03.000000000 +0200
+++ /etc/apparmor.d/usr.sbin.mysqld 2011-10-17 10:02:33.000000000 +0200
@@ -33,8 +33,8 @@
/var/lib/mysql/** rwk,
/var/log/mysql/ r,
/var/log/mysql/* rw,
- /var/run/mysqld/mysqld.pid w,
- /var/run/mysqld/mysqld.sock w,
+ /{,var/}run/mysqld/mysqld.pid w,
+ /{,var/}run/mysqld/mysqld.sock w,
/sys/devices/system/cpu/ r,
/home/manolinux/.opentpv/** rw,
===
Sorry to disturb you, Ubuntu develpers, but I hope at least this report
helps other people with similar problems.
Thanks.
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https://bugs.launchpad.net/bugs/876268
Title:
Mysqld does not start: Bind on unix socket: Permission denied
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