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By Wouter
#82437 Recently updated my ESP8266 core from 2.5.0 to 2.5.2, and noticed quite some changes (the upload works better; WiFi server seems more stable) but now I tried to upload my sketch data to SPIFFS and it failed with this error:

SPIFFS Error: esptool not found!

I tried switching on verbose for uploads and compilation but no further information given. A Google search on that message also came up empty, only some old discussions, nothing recent. As a result I can not upload anything to SPIFFS suddenly, which is of course a serious issue.

Arduino IDE 1.8.9, Linux Mint.