Update errors for comment and advice

I do occasionally get errors when updating my system and find that if I wait a few hours the errors are no longer present but on this occasion I am less confident as I do not recognise these errors. Having failed to get a clean update I have allowed the process to proceed and ignored the problem lines.
Running zypper verify produced no errors so in my ignorance I am posting this to ask if I should do anything more? The results of my update command are shown below:-

alastair@HP-Z640-1:~> sudo zypper up
[sudo] password for root: 
Loading repository data...
Reading installed packages...

The following package update will NOT be installed:
  youtube-dl-bash-completion

The following 7 packages are going to be upgraded:
  dmidecode libfreebl3 libfreebl3-hmac libsoftokn3 libsoftokn3-hmac mozilla-nss mozilla-nss-certs

7 packages to upgrade.
Overall download size: 2.0 MiB. Already cached: 0 B. After the operation, 4.1 KiB will be freed.
Continue? [y/n/v/...? shows all options] (y): y
Retrieving: dmidecode-3.4-150400.16.8.1.x86_64 (Update repository with updates from SUSE Linux Enterprise 15)             (1/7),  89.0 KiB    
Retrieving: dmidecode-3.4-150400.16.8.1.x86_64.rpm ................................................................................[not found]
File './x86_64/dmidecode-3.4-150400.16.8.1.x86_64.rpm' not found on medium 'http://download.opensuse.org/update/leap/15.4/sle/'
Abort, retry, ignore? [a/r/i/...? shows all options] (a): i
Warning: You have chosen to ignore a problem with download or installation of a package which might lead to broken dependencies of other packages. It is recommended to run 'zypper verify' after the operation has finished.
Retrieving: libfreebl3-3.79.4-150400.3.29.1.x86_64 (Update repository with updates from SUSE Linux Enterprise 15)         (2/7), 409.5 KiB    
Retrieving delta: ./x86_64/libfreebl3-3.79.4-150400.3.26.1_150400.3.29.1.x86_64.drpm, 114.2 KiB
Retrieving: libfreebl3-3.79.4-150400.3.26.1_150400.3.29.1.x86_64.drpm .............................................................[not found]
File './x86_64/libfreebl3-3.79.4-150400.3.26.1_150400.3.29.1.x86_64.drpm' not found on medium 'http://download.opensuse.org/update/leap/15.4/sle/'
Abort, retry, ignore? [a/r/i/...? shows all options] (a): i
Warning: You have chosen to ignore a problem with download or installation of a package which might lead to broken dependencies of other packages. It is recommended to run 'zypper verify' after the operation has finished.
SKIP request: User-requested skipping of a file
History:
 - Can't provide ./x86_64/libfreebl3-3.79.4-150400.3.26.1_150400.3.29.1.x86_64.drpm
 - File './x86_64/libfreebl3-3.79.4-150400.3.26.1_150400.3.29.1.x86_64.drpm' not found on medium 'http://download.opensuse.org/update/leap/15.4/sle/'

Retrieving: libfreebl3-3.79.4-150400.3.29.1.x86_64.rpm ............................................................................[not found]
File './x86_64/libfreebl3-3.79.4-150400.3.29.1.x86_64.rpm' not found on medium 'http://download.opensuse.org/update/leap/15.4/sle/'
Abort, retry, ignore? [a/r/i/...? shows all options] (a): i
Warning: You have chosen to ignore a problem with download or installation of a package which might lead to broken dependencies of other packages. It is recommended to run 'zypper verify' after the operation has finished.
Retrieving: libfreebl3-hmac-3.79.4-150400.3.29.1.x86_64 (Update repository with updates from SUSE Linux Enterprise 15)    (3/7), 117.6 KiB    
Retrieving: libfreebl3-hmac-3.79.4-150400.3.29.1.x86_64.rpm .......................................................................[not found]
File './x86_64/libfreebl3-hmac-3.79.4-150400.3.29.1.x86_64.rpm' not found on medium 'http://download.opensuse.org/update/leap/15.4/sle/'
Abort, retry, ignore? [a/r/i/...? shows all options] (a): i
Warning: You have chosen to ignore a problem with download or installation of a package which might lead to broken dependencies of other packages. It is recommended to run 'zypper verify' after the operation has finished.
Retrieving: mozilla-nss-certs-3.79.4-150400.3.29.1.x86_64 (Update repository with updates from SUSE Linux Enterprise 15)  (4/7), 283.0 KiB    
Retrieving delta: ./x86_64/mozilla-nss-certs-3.79.4-150400.3.26.1_150400.3.29.1.x86_64.drpm, 113.1 KiB
Retrieving: mozilla-nss-certs-3.79.4-150400.3.26.1_150400.3.29.1.x86_64.drpm ......................................................[not found]
File './x86_64/mozilla-nss-certs-3.79.4-150400.3.26.1_150400.3.29.1.x86_64.drpm' not found on medium 'http://download.opensuse.org/update/leap/15.4/sle/'
Abort, retry, ignore? [a/r/i/...? shows all options] (a): i
Warning: You have chosen to ignore a problem with download or installation of a package which might lead to broken dependencies of other packages. It is recommended to run 'zypper verify' after the operation has finished.
SKIP request: User-requested skipping of a file
History:
 - Can't provide ./x86_64/mozilla-nss-certs-3.79.4-150400.3.26.1_150400.3.29.1.x86_64.drpm
 - File './x86_64/mozilla-nss-certs-3.79.4-150400.3.26.1_150400.3.29.1.x86_64.drpm' not found on medium 'http://download.opensuse.org/update/leap/15.4/sle/'

Retrieving: mozilla-nss-certs-3.79.4-150400.3.29.1.x86_64.rpm ..........................................................................[done]
Retrieving: libsoftokn3-3.79.4-150400.3.29.1.x86_64 (Update repository with updates from SUSE Linux Enterprise 15)        (5/7), 289.9 KiB    
Retrieving delta: ./x86_64/libsoftokn3-3.79.4-150400.3.26.1_150400.3.29.1.x86_64.drpm, 125.5 KiB
Retrieving: libsoftokn3-3.79.4-150400.3.26.1_150400.3.29.1.x86_64.drpm ....................................................[done (11.0 KiB/s)]
Applying delta: ./libsoftokn3-3.79.4-150400.3.26.1_150400.3.29.1.x86_64.drpm ...........................................................[done]
Retrieving: mozilla-nss-3.79.4-150400.3.29.1.x86_64 (Update repository with updates from SUSE Linux Enterprise 15)        (6/7), 753.5 KiB    
Retrieving delta: ./x86_64/mozilla-nss-3.79.4-150400.3.26.1_150400.3.29.1.x86_64.drpm, 121.0 KiB
Retrieving: mozilla-nss-3.79.4-150400.3.26.1_150400.3.29.1.x86_64.drpm ....................................................[done (11.0 KiB/s)]
Applying delta: ./mozilla-nss-3.79.4-150400.3.26.1_150400.3.29.1.x86_64.drpm ...........................................................[done]
Retrieving: libsoftokn3-hmac-3.79.4-150400.3.29.1.x86_64 (Update repository with updates from SUSE Linux Enterprise 15)   (7/7), 117.6 KiB    
Retrieving: libsoftokn3-hmac-3.79.4-150400.3.29.1.x86_64.rpm ...............................................................[done (6.8 KiB/s)]
Installation has completed with error.
 
alastair@HP-Z640-1:~> sudo zypper verify
Loading repository data...
Reading installed packages...
Dependencies of all installed packages are satisfied.
alastair@HP-Z640-1:~> 

Not urgent but would like to understand a bit more.
Budge

Maybe the Server is out of sync, so waiting for a time.

This might have something to do with its possible replacement yt-dlp already being available and possibly preferred.

Hi,
Good point. I never use youtube as I always use yt-dlp. I shall remove youtube and see how I get on. Thanks for advice once more.