从 Ubuntu 14.04 跳到 19.04，一切都很好，直到我开始收到错误消息，指出它无法在 \'tunables/global/\' 第 17 行打开 \'tunables/proc\'：
\n\nerror: cannot perform the following tasks:\n- Setup snap "core" (7917) security profiles (cannot setup apparmor for snap "core": cannot create host snap-confine apparmor configuration: cannot reload snap-confine apparmor profile: cannot load apparmor profiles: exit status 1\napparmor_parser output:\nAppArmor parser error for /var/lib/snapd/apparmor/profiles/snap-confine.core.7917 in /etc/apparmor.d/tunables/global at line 17: Could not open \'tunables/proc\'\n)\n- Setup snap "core" (7917) security profiles (cannot create host snap-confine apparmor configuration: cannot reload snap-confine apparmor profile: cannot load …