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E: Failed to fetch http://raspbian.raspberrypi.org/raspbian/pool/main/
+g/gst-plugins-base1.0/gir1.2-gst-plugins-base-1.0_1.14.4-2_armhf.deb 
+ 404  Not Found [IP: 93.93.128.193 80]
E: Failed to fetch http://raspbian.raspberrypi.org/raspbian/pool/main/
+g/gst-plugins-ugly1.0/gstreamer1.0-plugins-ugly_1.14.4-1_armhf.deb  4
+04  Not Found [IP: 93.93.128.193 80]
E: Failed to fetch http://raspbian.raspberrypi.org/raspbian/pool/main/
+g/gst-plugins-base1.0/libgstreamer-plugins-base1.0-dev_1.14.4-2_armhf
+.deb  404  Not Found [IP: 93.93.128.193 80]
...
Reading package lists... Done        
E: Repository 'http://raspbian.raspberrypi.org/raspbian buster InRelea
+se' changed its 'Suite' value from 'stable' to 'oldstable'
N: This must be accepted explicitly before updates for this repository
+ can be applied. See apt-secure(8) manpage for details.

sudo apt-get install gstreamer1.0-plugins-ugly
sudo apt-get install gir1.2-gst-plugins-bad-1.0
sudo apt-get install gir1.2-gst-plugins-base-1.0
sudo apt-get install libgstreamer-plugins-base1.0-dev

checking for GST... no
configure: error: 
      You need to install or upgrade the GStreamer development
...
      or similar. The minimum version required is 1.0.0.
  
configure failed

$ lsb_release -a
No LSB modules are available.
...
# Uncomment line below then 'apt-get update' to enable 'apt-get source
+'
#deb-src http://raspbian.raspberrypi.org/raspbian/ buster main contrib
+ non-free rpi
$