From 9b1814fe33629eaf61cb488b05722cd1e82196aa Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Gerardo=20Marx=20Ch=C3=A1vez-Campos?=
 <gmarx_cc@itmorelia.edu.mx>
Date: Tue, 31 Aug 2021 01:47:53 +0000
Subject: [PATCH] Update 'README.md'

---
 README.md | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/README.md b/README.md
index df44970..af23868 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,16 @@
 # ubuntu
 
-Issues related to Ubuntu OS or related distributions
\ No newline at end of file
+Issues related to Ubuntu OS or related distributions
+
+## apt errors
+If you want to delete an wrong or non-working repository you can listed and delete by going to:
+
+```
+$ cd /etc/apt/sources.list.d
+$ ls 
+docker.list  elementary.list  owncloud.list  patches.list
+```
+
+and you can remove with `rm` commad, in my case I added by error the owncloud repository, thus, I have to remove it:
+
+