newbiecoder's questions

删除角色命令在我的 postgresql 11 中不起作用。我无法删除名为 'ckdev' 的角色。

 Role name |                         Attributes                         | Member of 
-----------+------------------------------------------------------------+-----------
 ckdev |                                                            | {}
 postgres  | Superuser, Create role, Create DB, Replication, Bypass RLS | {}

postgres-# drop role ckdev
postgres-# \du
                                   List of roles
 Role name |                         Attributes                         | Member of 
-----------+------------------------------------------------------------+-----------
 ckdev |                                                            | {}
 postgres  | Superuser, Create role, Create DB, Replication, Bypass RLS | {}

sudo apt-get install python 3.5.8
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Note, selecting 'libghc-blaze-svg-dev-0.3.5-84036:i386' for regex '3.5.8'
Note, selecting 'libghc-blaze-svg-prof-0.3.5-84036:i386' for regex '3.5.8'
Note, selecting 'libghc-blaze-svg-dev:i386' instead of 'libghc-blaze-svg-dev-0.3.5-84036:i386'
Note, selecting 'libghc-blaze-svg-prof:i386' instead of 'libghc-blaze-svg-prof-0.3.5-84036:i386'
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:
 dkms : Breaks: shim-signed (< 1.33.1~16.04.4) but 1.12+0.8-0ubuntu2 is to be installed
 libghc-blaze-svg-dev:i386 : Depends: libghc-base-dev-4.8.2.0-a3ce8:i386
                             Depends: libghc-blaze-markup-dev-0.7.0.3-608bf:i386
                             Depends: libghc-mtl-dev-2.2.1-05005:i386
 libghc-blaze-svg-prof:i386 : Depends: libghc-base-prof-4.8.2.0-a3ce8:i386
                              Depends: libghc-blaze-markup-prof-0.7.0.3-608bf:i386
                              Depends: libghc-mtl-prof-2.2.1-05005:i386