Unfortunately, when performing one upgrade, I misread the storage requirements and set it going before I realised that it would not have space to complete. I was somewhat surprised that it attempted to continue despite not having enough room and watched in dismay as each stage failed! I managed to clear sufficient space using the apt-get clean command (was that wise?) and re-ran the apt-get upgrade command but the system seemed to think that the previous attempt had been successful and that there was nothing more to do.
A couple of weeks has passed and an attempt today at an apt-get upgrade and apt-get dist-upgrade states that there are upgrades to be applied but I am concerned that these will not include the previously failed ones so I have not proceeded. I could revert to the original backup copy and start over but I have added packages and made configuration changes which I would rather not have to repeat.
Is there a way that I can force apt-get to re-apply the failed upgrade? Is there a way to perform a catch-up upgrade which will include all previous ones?
Clearly I need to read up on the configuration and use of apt-get but, in the short term, I would appreciate any assistance. I would also be obliged if someone could elaborate on the purpose and appropriate use of the following apt-get commands, as the man pages are quite brief on the subject:-