For reference, see below the content of the sources.list (comments stripped, source.list.d is empty; you can see that it does not contain neither 127.0.0.1 nor 2a03:687:4ea:4900:fe9f:937c:3487:4cd3 mentioned in the error messages; the 2a03:687:4ea:4900:fe9f:937c:3487:4cd3 is IP assigned by DHCP to the apt's localhost): deb http://lu.archive.ubuntu.com/ubuntu/ impish main restricted deb http://lu.archive.ubuntu.com/ubuntu/ impish-updates main restricted deb http://lu.archive.ubuntu.com/ubuntu/ impish universe deb http://lu.archive.ubuntu.com/ubuntu/ impish-updates universe deb http://lu.archive.ubuntu.com/ubuntu/ impish multiverse deb http://lu.archive.ubuntu.com/ubuntu/ impish-updates multiverse deb http://lu.archive.ubuntu.com/ubuntu/ impish-backports main restricted universe multiverse deb http://security.ubuntu.com/ubuntu impish-security main restricted deb http://security.ubuntu.com/ubuntu impish-security universe deb http://security.ubuntu.com/ubuntu impish-security multiverse
For reference, see below the content of the sources.list (comments stripped, source.list.d is empty; you can see that it does not contain neither 127.0.0.1 nor 2a03:687: 4ea:4900: fe9f:937c: 3487:4cd3 mentioned in the error messages; the 2a03:687: 4ea:4900: fe9f:937c: 3487:4cd3 is IP assigned by DHCP to the apt's localhost): lu.archive. ubuntu. com/ubuntu/ impish main restricted lu.archive. ubuntu. com/ubuntu/ impish-updates main restricted lu.archive. ubuntu. com/ubuntu/ impish universe lu.archive. ubuntu. com/ubuntu/ impish-updates universe lu.archive. ubuntu. com/ubuntu/ impish multiverse lu.archive. ubuntu. com/ubuntu/ impish-updates multiverse lu.archive. ubuntu. com/ubuntu/ impish-backports main restricted universe multiverse security. ubuntu. com/ubuntu impish-security main restricted security. ubuntu. com/ubuntu impish-security universe security. ubuntu. com/ubuntu impish-security multiverse
deb http://
deb http://
deb http://
deb http://
deb http://
deb http://
deb http://
deb http://
deb http://
deb http://