For the record, I hit that issue too. /boot got full. However, I could not fix it with the solution at https://forum.cloudron.io/topic/1310/disk-filled-up-with-kernel-update-artifacts/2 . I had to follow https://askubuntu.com/a/430944 (slightly adapted)
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SOLVED Upgrade still not progress ...
• saglagla -
SOLVED Apps using MySQL are not working
• girish -
SOLVED Backuptask crashed
• timmmmyboy -
SOLVED Changing Primary Domain
• ryangorley -
SOLVED connecting to sieve filter
• tadeas -
SOLVED Update in progress...
• RoboMod -
SOLVED What is an app's password??
• scooke -
SOLVED PHP mail() function fails
• M-arcus -
SOLVED VPN ISSUES
• saglagla -
SOLVED Forms, Scheduling etc
• seeker -
This topic is deleted!
• Beryllium -
SOLVED Unable to get nameservers
• TheNils -
SOLVED Cloudron build not starting
• M-arcus